Cross-link backwards compatibility policy with guidance
Cross-link backwards compatibility policy with guidance

Add links to contributor and release manager guidance.

Closes #8532.

PiperOrigin-RevId: 250890258

davidzchen/bazel,dslomov/bazel-windows,twitter-forks/bazel,cushon/bazel,perezd/bazel,cushon/bazel,cushon/bazel,perezd/bazel,ulfjack/bazel,dslomov/bazel-windows,dslomov/bazel,bazelbuild/bazel,akira-baruah/bazel,safarmer/bazel,akira-baruah/bazel,bazelbuild/bazel,dslomov/bazel,werkt/bazel,twitter-forks/bazel,davidzchen/bazel,ButterflyNetwork/bazel,dslomov/bazel,davidzchen/bazel,davidzchen/bazel,ulfjack/bazel,davidzchen/bazel,perezd/bazel,katre/bazel,werkt/bazel,aehlig/bazel,aehlig/bazel,aehlig/bazel,twitter-forks/bazel,cushon/bazel,cushon/bazel,katre/bazel,meteorcloudy/bazel,meteorcloudy/bazel,dslomov/bazel,perezd/bazel,perezd/bazel,ulfjack/bazel,werkt/bazel,aehlig/bazel,ButterflyNetwork/bazel,dslomov/bazel,ulfjack/bazel,safarmer/bazel,safarmer/bazel,akira-baruah/bazel,ulfjack/bazel,ButterflyNetwork/bazel,akira-baruah/bazel,aehlig/bazel,bazelbuild/bazel,katre/bazel,dslomov/bazel-windows,dslomov/bazel-windows,meteorcloudy/bazel,werkt/bazel,meteorcloudy/bazel,dslomov/bazel-windows,twitter-forks/bazel,meteorcloudy/bazel,werkt/bazel,perezd/bazel,safarmer/bazel,davidzchen/bazel,twitter-forks/bazel,akira-baruah/bazel,ulfjack/bazel,aehlig/bazel,ButterflyNetwork/bazel,dslomov/bazel,meteorcloudy/bazel,akira-baruah/bazel,twitter-forks/bazel,dslomov/bazel,bazelbuild/bazel,bazelbuild/bazel,ulfjack/bazel,ButterflyNetwork/bazel,katre/bazel,cushon/bazel,ButterflyNetwork/bazel,werkt/bazel,dslomov/bazel-windows,safarmer/bazel,katre/bazel,perezd/bazel,twitter-forks/bazel,bazelbuild/bazel,katre/bazel,aehlig/bazel,davidzchen/bazel,safarmer/bazel,meteorcloudy/bazel