Fix incorrect syntax in _deprecation.py warning message for _deprecate_list_output()

[mcgrath-k]

Micro edit!

I was cleaning up some code that leverages huggingface_hub, specifically I was using the method len(list_models(...)), which gave the deprecation warning:

FutureWarning: 'list_models' currently returns a list of objects but is planned to be a generator starting from version 0.14 in order to implement pagination. Please avoid to use `list_models(...).__len__` or explicitly convert the output to a list first with `list(iter(list_models)(...))`.
  warnings.warn(self._deprecation_msg.format(attr_name=attr_name), FutureWarning)

For some reason I read list(iter(list_models)(...)) way too literally, and thought that iter() worked similarly to a decorator or contained a nested function (that also took in ellipses as an arg).

I believe it is a typo, where the inside of this statement meant to express list_models(...) where the ellipses mean the optional function arguments to list_models. So just one misplaced parentheses haha.

Sorry for the silly nitpick, but perhaps it will save somebody the 20 minutes I spent looking at this! 😅

Please let me know if any modifications are needed, thanks!

[Wauplin]

Yep thanks, clearly a typo here. I changed it to a list comprehension to be even more explicit

[HuggingFaceDocBuilderDev]

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