Document attr access with custom transitions.
Document attr access with custom transitions.

RELNOTES: None
PiperOrigin-RevId: 273995905

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