HTML documentation does not distinguish between parameters and return values

[SnoopJ]

NOTE: I am filing this issue on behalf of a user who asked about wfdb in the #python channel on the Libera.chat IRC network.

The wfdb HTML documentation does not distinguish between parameters and return values, with a fairly confusing presentation to the user who is not aware of this flaw:

It seems that although wfdb uses the numpydoc style of docstrings, these docstrings are not being properly processed by the project's Sphinx configuration.

This is happening because wfdb is not using the numpydoc Sphinx extension. Installing a compatible version (numpydoc<1.6 is required by wfdb's current Sphinx version) and adding it to the extension list in conf.py produces a much more legible rendering. See #472.