Search for and retrieve documentation from LlamaIndex or LangChain sites.

This tool searches for relevant documentation using Serper API and then scrapes
the content from the top results to provide comprehensive information.

Args:
    query: Search query for documentation (e.g., "vector store", "chat models", "retrieval")
    library: The library to search for ('llamaindex' or 'langchain')
    max_results: Maximum number of documentation pages to retrieve (1-2, default 2)

Returns:
    Formatted documentation content from the search results