Docs: Include exceptions to combining selects
Docs: Include exceptions to combining selects

Coming across https://github.com/bazelbuild/bazel/issues/5419 it makes sense to document these issues as exceptions to the intuitive usage of combining selects with duplicate targets

Reasoning about this is provided in https://github.com/bazelbuild/bazel/commit/497ef110c344b2a309210339f125916f355530f9 and imho it makes sense to document this behaviour

Closes #15714.

PiperOrigin-RevId: 456596960
Change-Id: I7c0a5d573471bf988a6b83af03b85a8c75483321

bazelbuild/bazel,cushon/bazel,katre/bazel,bazelbuild/bazel,cushon/bazel,cushon/bazel,cushon/bazel,katre/bazel,katre/bazel,bazelbuild/bazel,cushon/bazel,bazelbuild/bazel,katre/bazel,katre/bazel,bazelbuild/bazel,cushon/bazel,katre/bazel,bazelbuild/bazel