chore(infra): add note to pr linting workflow (#33916)

Author: mdrxy

.github/workflows/pr_lint.yml

@@ -26,12 +26,14 @@
 #   * revert     — reverts a previous commit
 #   * release    — prepare a new release
 #
-# Allowed Scopes (optional):
+# Allowed Scope(s) (optional):
 #   core, cli, langchain, langchain_v1, langchain-classic, standard-tests,
 #   text-splitters, docs, anthropic, chroma, deepseek, exa, fireworks, groq,
 #   huggingface, mistralai, nomic, ollama, openai, perplexity, prompty, qdrant,
 #   xai, infra, deps
 #
+# Multiple scopes can be used by separating them with a comma.
+#
 # Rules:
 #   1. The 'Type' must start with a lowercase letter.
 #   2. Breaking changes: append "!" after type/scope (e.g., feat!: drop x support)