[SPARK-9864] [DOC] [MLlib] [SQL] Replace since in scaladoc to Since annotation

[MechCoder]

No description provided.

[MechCoder]

@mengxr @rxin

I wrote a small bash script to automate this to an extent (i.e for every file). (https://gist.github.com/MechCoder/fdc77f62050f2f698484) However it fails for some corner cases like badly formatted docs and I am not sure we would be needing this again, so I did not automate it fully and fixed the corner cases by hand.

[SparkQA]

Test build #41362 has finished for PR 8352 at commit 576f320.

• This patch fails Scala style tests.
• This patch merges cleanly.
• This patch adds no public classes.

[SparkQA]

Test build #41365 has finished for PR 8352 at commit 969bbbd.

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

[mengxr]

@MechCoder Could you move the changes in SQL to another PR? I think SQL is fine with @since tag. Switching to @Since will cause regression in the generated Java API doc. Let's experiment with @Since annotation in MLlib first:)

[MechCoder]

rebased

[SparkQA]

Test build #41373 has finished for PR 8352 at commit d6dbd4f.

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

[mengxr]

I checked all changes and they LGTM:) Thanks for fixing the styles too! Merged into master and branch-1.5. Could you have another PR to add Since to constructor params (if they are public)?

[MechCoder]

thanks for the merge. I will not be available till Monday itself :( . If this is in a hurry because of the 1.5 release, please feel free to fix it yourself.