Add info about how to prefer local default version to Bazel documentation.

RELNOTES: None.
PiperOrigin-RevId: 294304543
diff --git a/site/docs/bazel-and-apple.md b/site/docs/bazel-and-apple.md
index fe14f08..8792b6b 100644
--- a/site/docs/bazel-and-apple.md
+++ b/site/docs/bazel-and-apple.md
@@ -89,4 +89,5 @@
 you probably want to use the autogenerated
 `@local_config_xcode//:host_available_xcodes`. The default Xcode version is the
 newest mutually available version, if there is one, otherwise the default of the
-`local_versions` target.
+`local_versions` target. If you prefer to use the `local_versions` default
+as the default, you can pass `--experimental_prefer_mutual_default=false`.