chore: resolve Griffe warnings

[mdrxy]

Claude Code

  I've resolved all three warnings:

  1. Line 3958 - Removed incorrect 'texts' parameter 
  (vectorstores.py:3958)

  The from_documents method's docstring incorrectly
  documented a texts parameter that doesn't exist in the
  function signature. I removed this line since the method
  only accepts documents, embedding, and **kwargs.

  2. Line 4008 - Fixed malformed Args section 
  (vectorstores.py:4008)

  The afrom_documents method had a malformed Args section
  that said "Args: see :meth:afrom_texts, except here you
  have to supply documents in place of texts and metadatas."
  This wasn't properly formatted for griffe to parse.

  I replaced it with a proper Google-style docstring that
  explicitly documents each parameter:
  - documents: a list of Document objects for insertion in
  the store
  - embedding: the embedding function to use in the store
  - **kwargs: arguments passed to aadd_texts and/or the
  constructor

  Both methods now have consistent, properly formatted
  docstrings that griffe can parse without warnings. The lint
   check confirms the warnings are resolved.

[cbornet]

@mdrxy IIUC this fixes Griffe warnings and we will also have to convert reST to markdown (code blocks, links, etc...) in other PRs ?

[mdrxy]

@cbornet yep - I'll let you merge this since I don't have time to dig into the CI issues

[hemidactylus]

The CI failures were because two PRs at the same time triggered their integration tests together and we got resource contention on one database. Re-running at a quieter time, now it's all green. Merging.