Fix param in langchain-google-genai README

[MilanCancarevic]

I was updating package '@langchain/google-genai' to 0.2.10 from 0.1.8 and noticed that docs are mentioning old param modelName. By looking at typings from ChatGoogleGenerativeAI i see that it has been renamed to model

GoogleGenerativeAIEmbeddingsParams has alias for both so this raises question should alias be supported for ChatGoogleGenerativeAI - if yes i would like to work on it

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[hntrl]

Thanks for the change @MilanCancarevic!

Do you mean you want to see both modelName and model as params for ChatGoogleGenerativeAI? I'd call out that modelName is a broad deprecation that we have across all of langchain which will be removed in docs/examples/code in a later version. Some packages are more ahead than others in removing old deprecations in that regard.

[MilanCancarevic]

@hntrl I would prefer using model just so it's consistent, but since you are guys are already working on it then no changes are needed, thanks for making great framework