Integrate Breaking Change Policy into Eng Hub Docs

Should the Breaking Change Policy Docs be added to Eng Hub Directly? or is linking to them enough?

[Breaking Chage Policy Docs](http://aka.ms/AzBreakingChangesPolicy/)

Start by reviewing the Eng Hub docs and the linked Breaking Change Policy Docs. Determine whether the policy should be included directly or linked, then document the chosen approach in the Eng Hub; done means the policy is discoverable there and the integration decision is clear.

Written by the indexing model from the issue text.