Update "When to use" section in the docs

We now have a connection pool and client-side SQL formatting functions, which widens the advantages of using the library against a native API, even for sync connections. These should be listed there.

Search the documentation for the “When to use” section and read its surrounding guidance. Update that section to mention the connection pool and client-side SQL formatting functions as advantages over a native API, including for synchronous connections; the work is done when those points are accurately reflected in the rendered documentation.

Written by the indexing model from the issue text.