[3.12] Doc: Improve wording of ``os.path.commonpath()`` (GH-122627) (#122642)

Doc: Improve wording of ``os.path.commonpath()`` (GH-122627)
(cherry picked from commit 7a5c4103b094aaf1b65af6de65795d172cfe8fe0)

Co-authored-by: Matth-M <93771840+Matth-M@users.noreply.github.com>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
1 file changed