Update InferenceAPI docs (TGI update mostly)

[Wauplin]

Follow-up after https://github.com/huggingface/huggingface.js/pull/915 and https://github.com/huggingface/huggingface.js/pull/924.

Auto-generated update. Done by running:

cd scripts/api-inference
pnpm run generate
# and then commit changes

EDIT: I've slightly updated the generation script to include the type of each element in oneOf combinations. And to avoid making all elements "required" (since it's "oneOf").

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PR docs:

• chat completion (include image url)
• text generation (more param descriptions)

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.