[UPDATE] Valyu 0.2.0 langchain package (#31363)
docs: update Valyu integration notebooks to reflect current
langchain-valyu package implementation
Updated the Valyu integration documentation notebooks to align with the
current implementation of the langchain-valyu package. The changes
include:
- Updated ValyuContextRetriever to ValyuRetriever class name
- Changed parameter name from similarity_threshold to
relevance_threshold
- Removed query_rewrite parameter from search tool examples
- Added start_date and end_date parameters for time filtering
- Updated default values to match current implementation
(relevance_threshold: 0.5)
- Enhanced parameter documentation with proper descriptions and
constraints
- Updated section titles to reflect "Deep Search" functionality
