[3.13] Use correct markup in unittest.mock.reset_mock documentation (GH-119207) (GH-119250)

Use correct markup in unittest.mock.reset_mock documentation (GH-119207)
(cherry picked from commit 6b80a5b20f31a067bd1c374295608df5f1210f49)

Co-authored-by: Tialo <65392801+Tialo@users.noreply.github.com>