gh-94590: add signatures to operator itemgetter, attrgetter, methodcaller #94591
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Closes #94590
These functions were intentionally skipped when operator was updated to use the argument clinic:
#64385 (comment)
However, by not using the argument clinic, they missed out on getting signatures. This is a narrow PR to update the docstrings so that
__text_signature__
can be extracted from them. Updating to use the argument clinic is beyond scope.methodcaller
uses*args, **kwargs
to match variadic names used elsewhere (e.g.,operator.call
uses*args, **kwargs
).These changes are pretty minimal. Should I add tests (if so, where?) or a blurb?