Remove position_ids documentation from function
Author: wangyi7099
Pull request: yes

Removed unnecessary parameter documentation for position_ids.

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Comments:
**[For maintainers]** Suggested jobs to run (before merge)

run-slow: qwen2_vl

Good fix, but you might need to run `make fix-repo` and/or change the underlying `modular` file to propagate the change to other models that are copying from Qwen!