[3.12] gh-109408: Add the docs whitespace check from patchcheck to pre-commit (GH-109854) (#110594)

gh-109408: Add the docs whitespace check from patchcheck to pre-commit (GH-109854)
(cherry picked from commit 7426ed0347d66f7ef61ea7ae6c3163258b8fb128)

Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>