fixed gemma3 collection path pointing to llama 2 collection.

[dmgcsilva]

What does this PR do?

Replaces a URL that should point to the Gemma3 model collection, but points to the Llama 2 collection.

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Who can review?

@stevhliu

[github-actions]

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[stevhliu]

Good catch, thanks so much! Feel free to mark it as ready for review

[HuggingFaceDocBuilderDev]

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