Update InferenceClient docstring to reflect that token=False is no longer accepted

[abidlabs]

Just wondering -- is there still any way not to pass in the local hf token?

[HuggingFaceDocBuilderDev]

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[hanouticelina]

@abidlabs in practice, HF Inference API still supports passing token=False. We removed that to simplify the logic by avoiding the handle of boolean token for external providers.

[julien-c]

but the HF Inference API requires a token, right? (or if not, it will very very soon)

[Wauplin]

I noticed our internal logic for token=False doesn't really work at the moment (local token is still passed). I'll fix this in a follow-up PR.

And yes with the new inference providers, even HF Inference requires a token now.