langchain

f0ada1a3 - docs: Update quickstart.mdx - Fix 422 error in example with LangServe client code (#17163)

docs: Update quickstart.mdx - Fix 422 error in example with LangServe client code (#17163) **Description:**: Fix 422 error in example with LangServe client code httpx.HTTPStatusError: Client error '422 Unprocessable Entity' for url 'http://localhost:8000/agent/invoke'