DOC: matrix_rank
DOC: more matrix_rank docs
MAINT: remove use of ``reload`` from f2py.  See gh-4139.
Merge pull request #4158 from rgommers/f2py-no-reload

MAINT: remove use of ``reload`` from f2py.  See gh-4139.
Merge pull request #4149 from argriffing/doc-matrix-rank

DOC: matrix_rank