Support `HF_TOKEN_PATH` as environment variable (#2185)
* Support HF_TOKEN_PATH as environment variable
* Update docs/source/en/package_reference/environment_variables.md
Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>
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Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>