[doc] add a note to visibility specification to avoid confusion
[doc] add a note to visibility specification to avoid confusion

PiperOrigin-RevId: 401316402

perezd/bazel,perezd/bazel,bazelbuild/bazel,katre/bazel,ButterflyNetwork/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,cushon/bazel,cushon/bazel,ButterflyNetwork/bazel,perezd/bazel,cushon/bazel,bazelbuild/bazel,cushon/bazel,katre/bazel,bazelbuild/bazel,katre/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,perezd/bazel,perezd/bazel,katre/bazel,perezd/bazel,cushon/bazel,katre/bazel,cushon/bazel,bazelbuild/bazel,ButterflyNetwork/bazel,perezd/bazel,ButterflyNetwork/bazel,katre/bazel