[7.8] [DOCS] Adds breaking changes for 7.8 (#68588)#69227

Merged

gchaps merged 1 commit intoelastic:7.8from gchaps:backport/7.8/pr-68588

Jun 16, 2020

+525

Commits on Jun 16, 2020

[DOCS] Adds breaking changes for 7.8 (elastic#68588 )
gchaps
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