projection kwarg could be better documented. #17088
Description
Bug report
Bug summary
The projection kwarg for fig.add_subplot does not make it clear that it can also take a subclass of Axes as an argument (I think, its all a little unclear).
projection : {None, 'aitoff', 'hammer', 'lambert', 'mollweide', 'polar', 'rectilinear', str}, optional
The projection type of the subplot (Axes). str is the name of a custom projection, see projections. The default None results in a 'rectilinear' projection.