examples: Explain Bazel BCR releases and git_override option

Author: ejona86

examples/MODULE.bazel

@@ -4,7 +4,16 @@ bazel_dep(name = "protobuf", repo_name = "com_google_protobuf", version = "23.1"
 bazel_dep(name = "rules_jvm_external", version = "6.0")
 bazel_dep(name = "rules_proto", version = "5.3.0-21.7")
 
-# Do not use this override in your own MODULE.bazel. Use a version from BCR
+# Do not use this override in your own MODULE.bazel. It is unnecessary when
+# using a version from BCR. Be aware the gRPC Java team does not update the
+# BCR for new releases, so you may need to create a PR for the BCR to add the
+# version. To not use the BCR, you could use:
+#
+# git_override(
+#    module_name = "grpc-java",
+#    remote = "https://github.com/grpc/grpc-java.git",
+#    tag = "v<VERSION>",
+# )
 local_path_override(
     module_name = "grpc-java",
     path = "..",