[SPARK-20506][DOCS] 2.2 migration guide#17996

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MLnick wants to merge 7 commits intoapache:masterfrom

MLnick:SPARK-20506-2.2-migration-guide

Commits on May 16, 2017

Migration guide 2.1->2.2
Nick Pentreath
committed
Bump expected parity release number
Nick Pentreath
committed
Update migration guide
Nick Pentreath
committed

Commits on May 18, 2017

Add string indexer fix to behavior changes section
Nick Pentreath
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Add release highlights section
Nick Pentreath
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Add FPGrowth to highlights list
Nick Pentreath
committed

Commits on May 19, 2017

Correct JIRA link for correlation
Nick Pentreath
committed