Make examples correct #1013

Job	Run time
mypy	14s
build_python_27 (ubuntu-20.04, yes)	2m 48s
build_python_27 (ubuntu-20.04, no)	2m 37s
build (3.6, yes, ubuntu-20.04)	2m 45s
build_python_27 (windows-latest, yes)	4m 34s
python_no_gil	5m 33s
build (3.6, no, ubuntu-20.04)	2m 45s
build_python_27 (windows-latest, no)	4m 24s
test_c_linux (0, x64)	49s
build (3.7, yes, ubuntu-20.04)	2m 42s
test_c_linux (0, x32)	1m 3s
build (3.7, no, ubuntu-20.04)	2m 45s
test_c_linux (1, x64)	55s
build (3.8, yes, ubuntu-20.04)	2m 22s
test_c_linux (1, x32)	1m 13s
build (3.8, no, ubuntu-20.04)	2m 23s
test_c_windows (x64)	1m 23s
build (3.9, yes, ubuntu-20.04)	4m 40s
build (3.9, no, ubuntu-20.04)	4m 40s
test_c_windows (win32)	1m 22s
build (3.10, yes, ubuntu-20.04)	4m 45s
build (3.10, no, ubuntu-20.04)	4m 35s
build (3.11, yes, ubuntu-20.04)	4m 22s
build (3.11, no, ubuntu-20.04)	4m 25s
build (3.12, yes, ubuntu-20.04)	4m 21s
build (3.12, no, ubuntu-20.04)	4m 26s
build (3.13-dev, yes, ubuntu-20.04)	4m 31s
build (3.13-dev, no, ubuntu-20.04)	4m 39s
build (3.12, yes, macos-12)	1s
build (3.12, no, windows-latest)	3m 58s
build (3.12, yes, windows-latest)	4m 18s
build (pypy2.7, no, ubuntu-latest)	1m 40s
build (pypy3.9, no, ubuntu-latest)	3m 56s
	1h 41m 54s

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