[SPARK-5058] Part 2. Typos and broken URL

[jongyoul]

• Also fixed java link

[SparkQA]

Test build #26007 has started for PR 4172 at commit 6be03e5.

• This patch merges cleanly.

[jongyoul]

/cc @tdas This PR is a second part of SPARK-5058 which you already reviewed and resolved.

[SparkQA]

Test build #26007 has finished for PR 4172 at commit 6be03e5.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[AmplabJenkins]

Test FAILed.
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[jongyoul]

retest this please

[SparkQA]

Test build #26012 has started for PR 4172 at commit 6be03e5.

• This patch merges cleanly.

[SparkQA]

Test build #26012 has finished for PR 4172 at commit 6be03e5.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

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Test PASSed.
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[srowen]

Looks like a good follow-on change to #3877 . I noted that github seems to redirect the /tree URLs to /blob URLs (that's not what's being 'fixed' here) and we have a mix of both, but yeah, when changing links we can just point to /blob as well.

[rxin]

Thanks. Merging in master and branch-1.2.