[Inference Providers] Regenerate docs

[hanouticelina]

Note

Low Risk
Auto-generated markdown-only updates to example model mappings; no runtime or API code changes.

Overview
Regenerated Inference Providers docs so examples match current provider/model availability.

SambaNova now documents Chat Completion (LLM) with an InferenceSnippet for openai/gpt-oss-120b, and SambaNova is included in the shared chat-completion task providersMapping.

Together text-to-image examples now use stabilityai/stable-diffusion-xl-base-1.0 instead of black-forest-labs/FLUX.1-schnell on the Together provider page and the text-to-image task page.

^{Reviewed by Cursor Bugbot for commit 6a21616. Configure here.}

[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.