docs: set HuggingFaceEndpoint task for Mixtral examples

[Smile232323]

Summary

• set for HuggingFaceEndpoint in LangChain and Visual Grounding notebooks
• ensures Mixtral-8x7B-Instruct uses the correct Hugging Face inference task

Testing

• not run (docs-only change)

Refs #2080

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[dolfim-ibm]

@Smile232323 can you please sign off your commits in this PR?

[PeterStaar-IBM]

@Smile232323 Can you please sign of your commits.

follow the instructions here: #2945 (comment)

[Smile232323]

Hi maintainers — thank you again for the review and approval on this PR.

The DCO issue should now be resolved, and the current PR head shows DCO, dco_advisor, and Mergify Merge Protections as passing.

GitHub is still showing the PR as BLOCKED on my side. From what I can tell, the main branch ruleset expects several Run CI status contexts, but those checks do not appear to be attached to the current PR head.

If convenient, could you please help refresh or rerun the required checks, or let me know if there is anything further I should do from my side?

Thank you very much.