[issue43938] Document that dataclasses.FrozenInstanceError derives from AttributeError

[Llandy Riveron Del Risco]

Llandy Riveron Del Risco <llandy3d at gmail.com> added the comment:

The CLA should be correctly signed. Using this message as a test to see if the star appears correctly after the name.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43938>
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