Fix documentation for cKDTree.sparse_distance_matrix
DOC: stats: remove duplicated names from the mstats module docstring
MAINT: stats: A bit of docstring and whitespace clean up.
BUG: sparse/superlu: fix || vs && mistake in L/U attributes + add test
Merge pull request #3627 from WarrenWeckesser/stats-doc

MAINT: stats: A bit of clean up
Merge pull request #3625 from thouis/patch-1

Fix documentation for cKDTree.sparse_distance_matrix
Merge pull request #3635 from pv/splu-lu-bug

BUG: sparse/superlu: fix || vs && mistake in L/U attributes + add test