[3.12] docs:fix over-linking in dataclasses.rst (GH-117005) (#117163)

* docs: fix over-linking in dataclasses.rst (#117005)

(cherry picked from commit 0907871d43bffb613cbd560224e1a9db13d06c06)

* [3.12] docs: fix over-linking in dataclasses.rst (GH-117005)
(cherry picked from commit 0907871d43bffb613cbd560224e1a9db13d06c06)

Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>

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Co-authored-by: Ned Batchelder <ned@nedbatchelder.com>