Add mention of package_group's own visibility
Add mention of package_group's own visibility

Follow-up to #8982.

RELNOTES: None
PiperOrigin-RevId: 311500526

bazelbuild/bazel,safarmer/bazel,ButterflyNetwork/bazel,perezd/bazel,twitter-forks/bazel,perezd/bazel,ulfjack/bazel,ulfjack/bazel,meteorcloudy/bazel,davidzchen/bazel,twitter-forks/bazel,davidzchen/bazel,meteorcloudy/bazel,ButterflyNetwork/bazel,ButterflyNetwork/bazel,twitter-forks/bazel,cushon/bazel,cushon/bazel,katre/bazel,ulfjack/bazel,perezd/bazel,davidzchen/bazel,katre/bazel,ulfjack/bazel,ButterflyNetwork/bazel,cushon/bazel,bazelbuild/bazel,davidzchen/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,werkt/bazel,katre/bazel,cushon/bazel,twitter-forks/bazel,meteorcloudy/bazel,safarmer/bazel,perezd/bazel,meteorcloudy/bazel,davidzchen/bazel,katre/bazel,ulfjack/bazel,bazelbuild/bazel,perezd/bazel,meteorcloudy/bazel,meteorcloudy/bazel,twitter-forks/bazel,werkt/bazel,safarmer/bazel,ButterflyNetwork/bazel,twitter-forks/bazel,perezd/bazel,werkt/bazel,werkt/bazel,safarmer/bazel,katre/bazel,werkt/bazel,cushon/bazel,werkt/bazel,meteorcloudy/bazel,davidzchen/bazel,twitter-forks/bazel,davidzchen/bazel,ulfjack/bazel,bazelbuild/bazel,perezd/bazel,safarmer/bazel,cushon/bazel,katre/bazel,safarmer/bazel,bazelbuild/bazel,ulfjack/bazel