langchain

7025fa23 - Docs: Add missing import of 'ConfigurableField' in 'Full code comparison' example in LCEL (#15661)

Docs: Add missing import of 'ConfigurableField' in 'Full code comparison' example in LCEL (#15661) <!-- Thank you for contributing to LangChain! Please title your PR "<package>: <description>", where <package> is whichever of langchain, community, core, experimental, etc. is being modified. Replace this entire comment with: - **Description:** Add missing import of 'ConfigurableField' in 'Full code comparison' example in LCEL - **Issue:** Example code not running - **Dependencies:** None - **Twitter handle:** @heyyoshan