[3.13] gh-133046: Reformat the ``ast`` module docstring (GH-133050) (GH-133060)

[3.13] gh-133046: Reformat the ``ast`` module docstring (GH-133050) (GH-133060)

gh-133046: Reformat the ``ast`` module docstring (GH-133050)

* Fix formatting in module docstring for `ast` https://github.com/python/cpython/issues/133046
* GH-133046 ast docstring: remove header, dedent, 80-char width.
* Keep existing wrapping

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(cherry picked from commit 6d53b752831c453da115dd4ce54a0d121d9990cd)

Co-authored-by: Hunter Hogan <hunterhogan@users.noreply.github.com>
Co-authored-by: Adam Turner <9087854+aa-turner@users.noreply.github.com>