[Misc] Avoid misleading warning messages

[jeejeelee]

For QWenLMHeadModel and ChatGLMForCausalLM, where multimodal model and LLM share the same model class, incorrect warning messages are output when enabling LoRA for LLM.

BTW, fix QWenLMHeadModel small typo.

ping @DarkLight1337

[github-actions]

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[DarkLight1337]

I think we can only inherit from SupportsMultiModal in QWenVL (i.e. don't inherit SupportsMultiModal in QWenLLM) to avoid having to modify the existing check logic.

[jeejeelee]

I think we can only inherit from SupportsMultiModal in QWenVL (i.e. don't inherit SupportsMultiModal in QWenLLM) to avoid having to modify the existing check logic.

Sounds great, I will handling it asap

[jeejeelee]

@DarkLight1337 I have handled it, please review it again, thanks