langchain

b258ff19 - Docs: Add 'Optional' to installation section to fix an issue (#28902)

Docs: Add 'Optional' to installation section to fix an issue (#28902) Problem: "Optional" object is used in one example without importing, which raises the following error when copying the example into IDE or Jupyter Lab  Solution: Just importing Optional from typing_extensions module, this solves the problem! --------- Co-authored-by: Erick Friis <erick@langchain.dev>