docs: examples --> Testable Examples

[sprive]

I wanted to distinguish Go's "Testable Examples" as something more than "examples".

./build.sh ran OK:

$ ./build.sh
go: downloading github.com/client9/misspell v0.3.4
go: downloading github.com/po3rin/gofmtmd v0.1.3
go: downloading github.com/spf13/cobra v0.0.5
go: downloading gopkg.in/russross/blackfriday.v2 v2.0.0
go: downloading github.com/shurcooL/sanitized_anchor_name v1.0.0
go: downloading github.com/spf13/pflag v1.0.3
formatting  file: ./LICENSE.md
formatting  file: ./README.md
formatting  file: ./SUMMARY.md
formatting  file: ./anti-patterns.md
formatting  file: ./app-intro.md
formatting  file: ./arrays-and-slices.md
formatting  file: ./command-line.md
formatting  file: ./concurrency.md
formatting  file: ./context-aware-reader.md
formatting  file: ./context.md
formatting  file: ./contributing.md
formatting  file: ./dependency-injection.md
formatting  file: ./error-types.md
formatting  file: ./gb-readme.md
formatting  file: ./generics.md
formatting  file: ./hello-world.md
formatting  file: ./html-templates.md
formatting  file: ./http-handlers-revisited.md
formatting  file: ./http-server.md
formatting  file: ./install-go.md
formatting  file: ./integers.md
formatting  file: ./intro-to-acceptance-tests.md
formatting  file: ./io.md
formatting  file: ./iteration.md
formatting  file: ./json.md
formatting  file: ./maps.md
formatting  file: ./math.md
formatting  file: ./mocking.md
formatting  file: ./os-exec.md
formatting  file: ./pdf-cover.md
formatting  file: ./pointers-and-errors.md
formatting  file: ./reading-files.md
formatting  file: ./refactoring-checklist.md
formatting  file: ./reflection.md
formatting  file: ./revisiting-arrays-and-slices-with-generics.md
formatting  file: ./roman-numerals.md
formatting  file: ./scaling-acceptance-tests.md
formatting  file: ./select.md
formatting  file: ./structs-methods-and-interfaces.md
formatting  file: ./sync.md
formatting  file: ./template.md
formatting  file: ./time.md
formatting  file: ./websockets.md
formatting  file: ./why.md
formatting  file: ./working-without-mocks.md
ok      github.com/quii/learn-go-with-tests/arrays/v1   0.156s
ok      github.com/quii/learn-go-with-tests/arrays/v2   0.300s
ok      github.com/quii/learn-go-with-tests/arrays/v3   0.783s
ok      github.com/quii/learn-go-with-tests/arrays/v4   0.613s
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ok      github.com/quii/learn-go-with-tests/arrays/v6   0.920s
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ok      github.com/quii/learn-go-with-tests/arrays/v8   0.930s
ok      github.com/quii/learn-go-with-tests/blogrenderer        0.440s
?       github.com/quii/learn-go-with-tests/command-line/v1/cmd/cli     [no test files]
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?       github.com/quii/learn-go-with-tests/command-line/v3/cmd/cli     [no test files]
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ok      github.com/quii/learn-go-with-tests/command-line/v1     0.227s
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ok      github.com/quii/learn-go-with-tests/command-line/v3     0.452s
ok      github.com/quii/learn-go-with-tests/concurrency/v1      0.646s
?       github.com/quii/learn-go-with-tests/hello-world/v1      [no test files]
ok      github.com/quii/learn-go-with-tests/concurrency/v2      2.539s
ok      github.com/quii/learn-go-with-tests/concurrency/v3      0.811s
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ok      github.com/quii/learn-go-with-tests/hello-world/v2      0.524s
ok      github.com/quii/learn-go-with-tests/hello-world/v3      0.565s
ok      github.com/quii/learn-go-with-tests/hello-world/v4      0.647s
ok      github.com/quii/learn-go-with-tests/hello-world/v5      0.635s
ok      github.com/quii/learn-go-with-tests/hello-world/v6      0.640s
ok      github.com/quii/learn-go-with-tests/hello-world/v7      0.764s
ok      github.com/quii/learn-go-with-tests/hello-world/v8      0.871s
ok      github.com/quii/learn-go-with-tests/http-server/v1      0.882s
ok      github.com/quii/learn-go-with-tests/http-server/v2      0.793s
ok      github.com/quii/learn-go-with-tests/http-server/v3      0.723s
ok      github.com/quii/learn-go-with-tests/http-server/v4      0.806s
ok      github.com/quii/learn-go-with-tests/http-server/v5      0.787s
ok      github.com/quii/learn-go-with-tests/integers/v1 0.845s
ok      github.com/quii/learn-go-with-tests/integers/v2 0.762s
ok      github.com/quii/learn-go-with-tests/io/v1       0.725s
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ok      github.com/quii/learn-go-with-tests/json/v1     0.799s
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ok      github.com/quii/learn-go-with-tests/json/v6     0.737s
ok      github.com/quii/learn-go-with-tests/maps/v1     0.857s
ok      github.com/quii/learn-go-with-tests/maps/v2     0.855s
ok      github.com/quii/learn-go-with-tests/maps/v3     0.816s
ok      github.com/quii/learn-go-with-tests/maps/v4     0.771s
?       github.com/quii/learn-go-with-tests/math/v10/clockface/clockface        [no test files]
ok      github.com/quii/learn-go-with-tests/maps/v5     0.740s
?       github.com/quii/learn-go-with-tests/math/v11/clockface/clockface        [no test files]
ok      github.com/quii/learn-go-with-tests/maps/v6     0.742s
ok      github.com/quii/learn-go-with-tests/maps/v7     0.764s
?       github.com/quii/learn-go-with-tests/math/v12/clockface/clockface        [no test files]
ok      github.com/quii/learn-go-with-tests/math/v1/clockface   0.784s
ok      github.com/quii/learn-go-with-tests/math/v10/clockface  0.731s
ok      github.com/quii/learn-go-with-tests/math/v11/clockface  0.698s
ok      github.com/quii/learn-go-with-tests/math/v12/clockface  0.557s
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ok      github.com/quii/learn-go-with-tests/math/v2/clockface   0.693s
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ok      github.com/quii/learn-go-with-tests/math/vFinal/clockface       0.600s
ok      github.com/quii/learn-go-with-tests/math/vFinal/clockface/svg   0.568s
ok      github.com/quii/learn-go-with-tests/mocking/v1  0.686s
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ok      github.com/quii/learn-go-with-tests/mocking/v5  0.740s
ok      github.com/quii/learn-go-with-tests/pointers/v1 0.754s
ok      github.com/quii/learn-go-with-tests/pointers/v2 0.761s
ok      github.com/quii/learn-go-with-tests/pointers/v3 0.760s
ok      github.com/quii/learn-go-with-tests/pointers/v4 0.767s
ok      github.com/quii/learn-go-with-tests/q-and-a/context-aware-reader        0.767s
ok      github.com/quii/learn-go-with-tests/q-and-a/error-types 0.616s
ok      github.com/quii/learn-go-with-tests/q-and-a/error-types/v2      0.719s
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ok      github.com/quii/learn-go-with-tests/reflection/v1       0.806s
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ok      github.com/quii/learn-go-with-tests/roman-numerals/v1   0.762s
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ok      github.com/quii/learn-go-with-tests/roman-numerals/v11  0.695s
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ok      github.com/quii/learn-go-with-tests/roman-numerals/v3   0.722s
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ok      github.com/quii/learn-go-with-tests/roman-numerals/v5   0.726s
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ok      github.com/quii/learn-go-with-tests/roman-numerals/v7   0.734s
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ok      github.com/quii/learn-go-with-tests/roman-numerals/v9   0.740s
ok      github.com/quii/learn-go-with-tests/select/v1   0.702s
ok      github.com/quii/learn-go-with-tests/select/v2   0.724s
ok      github.com/quii/learn-go-with-tests/select/v3   0.793s
ok      github.com/quii/learn-go-with-tests/structs/v1  0.886s
ok      github.com/quii/learn-go-with-tests/structs/v2  0.896s
ok      github.com/quii/learn-go-with-tests/structs/v3  0.904s
ok      github.com/quii/learn-go-with-tests/structs/v4  0.833s
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ok      github.com/quii/learn-go-with-tests/structs/v6  0.684s
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?       github.com/quii/learn-go-with-tests/time/v1/cmd/cli     [no test files]
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ok      github.com/quii/learn-go-with-tests/time/v2     0.415s
ok      github.com/quii/learn-go-with-tests/time/v3     0.333s
ok      github.com/quii/learn-go-with-tests/todo        0.501s
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ok      github.com/quii/learn-go-with-tests/websockets/v2       0.532s

[quii]

Nice change 👍