It has been bothering me that in general, kwargs are not very uniform at all in the docs. In many places they are listed after a simple "Addition keyword arguments... : ". Numpydoc does allow for the section Other Parameters (underscored with dashes) but it does not seem to render properly with the Parameters and Returns section table. The Other Parameters section doesn't seem to actually be used inthe numpy docs. However, there are several instances of it in mpl/axes/_axes.py.

Looking at the html in a browser inspector, you can see that Parameters and Returns are the header to a<tr> and the contents are in the respective<td>. However, with Other Parameters, the contents are being inserted into a new<tr>following the Other Parameters row.