Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Documentation: Remove bazel issue
  Documentation: Refactor to match other plugin documentation
  Documentation: Add missing plugin standalone and in-tree testing
  Upgrade bazlets to latest stable-2.16

Change-Id: I26e6fc8ca64ca77c38c1220a9a0639b5681680dd