[3.12] gh-132221: Fix `__match_args__` generation docs in `dataclasses.rst` (GH-132222) (#132227)

gh-132221: Fix `__match_args__` generation docs in `dataclasses.rst` (GH-132222)
(cherry picked from commit 8b62374b344f5da852bed9f16619736d4d43936b)

Co-authored-by: sobolevn <mail@sobolevn.me>