Documentation Link

https://matplotlib.org/devdocs/gallery/images_contours_and_fields/contourf_demo.html

Problem

The docstring for contourf states that the origin keyword "is only relevant, if X, Y are not given". The contourf demo passes X, Y and origin for most of its examples.

Suggested improvement

The simplest thing would be to strip out origin where it's not relevant, but it might be nice to show some examples where it does make a difference.