[guides] Add guide on release branches and cherry-picking commits (#5551)
[guides] Add guide on release branches and cherry-picking commits (#5551)

* [guides] Add guide on release branches and cherry-picking commits

This is a guide on how we structure our release branches, perform releases from them, and how to commit bug-fixes and where those commits belong.

* [guides] Add section on incrementing version numbers to guide

* Update Release Branches.md

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