clarify comment is an internal detail

Author: rickeylev

gazelle/examples/bzlmod_build_file_generation/.bazelrc

@@ -8,7 +8,9 @@ common --experimental_enable_bzlmod
 coverage --java_runtime_version=remotejdk_11
 common:bazel7.x --incompatible_python_disallow_native_rules
 
-# NOTE: rules_python MUST be overridden using bazelrc config.
-# This is because the BCR presubmits run with a different directory
-# structure, so override this to remove the override.
+# NOTE: This override is specific to the development of gazelle itself
+# and the testing of it during its BCR release presubmits.
+# In development of gazelle itself, we override it to the development
+# rules_python code. In the BCR presubmits, this override is removed
+# and the bazel_dep version of rules_python is used.
 common --override_module=rules_python=../../../