[docs] Need more info on recommendations for `Collection::count_documents` methods

[cailloumajor]

Hi, in the documentation for the methods Collection::count_documents and Collection::count_documents_with_session, it is recommended to use another method (Collection::estimated_document_count). I didn't find any such recommendation nor explanation for this in https://www.mongodb.com/docs/v7.0/reference/method/db.collection.countDocuments/. Furthermore, these methods do not have the same purpose as the recommended one.

If relevant, I would be happy to make a pull request.

[isabelatkinson]

Hey @cailloumajor, you're right that this recommendation does not align with the MongoDB-wide guidance on how to use these methods. We would recommended using estimatedDocumentCount when an outdated/incorrect count is tolerated (see here for more info) and count when total accuracy is needed. Feel free to make a pull request updating this info if you'd like to!

[github-actions]

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