[SPARK-23112][DOC] Update ML migration guide with breaking and behavior changes. - #20421

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MLnick wants to merge 6 commits into

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MLnick:SPARK-23112-ml-guide

Commits on Jan 23, 2018

Add highlights and migration guide for 2.3
Nick Pentreath
committed
184d113

Commits on Jan 29, 2018

Merge branch 'master' into SPARK-23112-ml-guide
Nick Pentreath
committed
cebc496
Update migration guide with breaking changes
Nick Pentreath
committed
b6fcf15

Commits on Jan 30, 2018

Update behavior change items
Nick Pentreath
committed
4433d9c
Add more behavior change items
Nick Pentreath
committed
4a957f6
Update MLOR summary note
Nick Pentreath
committed
469d87d