parameterized the number of documentation documents to be retrieved

[GiacomoPracucci]

I am working with ChromaDB with many small documentation documents and need to increase the number of retrieved documentation documents from the vectorstore.

it would be useful to also be able to parameterize the number of documentation documents to be retrieved from the vectorstore

fixes #353

[andreped]

@GiacomoPracucci Can you add the "fixes #353" to the PR description. That way when this PR is merged, the issue will automatically be closed.

[zainhoda]

Thanks @GiacomoPracucci !

@andreped I made some changes here -- the parameters are n_results_sql, n_results_documentation, and n_results_sql which if not present, back up to n_results, and then default to 10.

This gives the user the option to granularly set the n_results for each type or to set them all at once or to omit them. WDYT?

[andreped]

@zainhoda LGTM :) Looking forward to testing this on Monday hopefully. Great job!