[DOCS] Adds breaking changes for 7.6#56437

Merged

gchaps merged 3 commits intoelastic:7.xfrom gchaps:docs/7.6/breaking_changes

Jan 30, 2020

+1,901-2

Commits on Jan 29, 2020

adding api changes for 7.6

timductive
authored and
gchaps
committed

Commits on Jan 30, 2020