docs: Add FAISS Filter with Advanced Query Operators Documentation & Demonstration (#28938)
## Description
This pull request updates the documentation for FAISS regarding filter
construction, following the changes made in commit `df5008f`.
## Issue
None. This is a follow-up PR for documentation of
[#28207](https://github.com/langchain-ai/langchain/pull/28207)
## Dependencies:
None.
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Co-authored-by: Chester Curme <chester.curme@gmail.com>