[7.6] [DOCS] Adds breaking changes for 7.6 (#56437)#56451

Merged

gchaps merged 1 commit intoelastic:7.6from gchaps:backport/7.6/pr-56437

Jan 30, 2020

+1,901-2

Commits on Jan 30, 2020

[DOCS] Adds breaking changes for 7.6 (elastic#56437 )

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