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f112eab9 - [modular] fix a bug in mellon param & improve docstrings (#12980)

[modular] fix a bug in mellon param & improve docstrings (#12980) * update mellonparams docstring to incude the acutal param definition render in mellon * style --------- Co-authored-by: yiyi@huggingface.co <yiyi@ip-26-0-160-103.ec2.internal>