[doc] fix supported_models

[zzzzwwjj]

What this PR does / why we need it?

Add Experimental supported model/feature for supported_models.md

Does this PR introduce any user-facing change?

How was this patch tested?

• vLLM version: v0.16.0
• vLLM main: vllm-project/vllm@15d76f7

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the clarity of the supported_models.md documentation by introducing a new legend entry. This addition allows for better communication of the status of features and models that are currently under experimental support, providing users with more precise information regarding their stability and readiness.

Highlights

• Documentation Update: Added a new legend entry (🔵 = Experimental supported model/feature) to supported_models.md to clearly indicate features under experimental support.

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Changelog

• docs/source/user_guide/support_matrix/supported_models.md
  • Added a new legend entry for 'Experimental supported model/feature'.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for supported models by adding a legend entry for 'Experimental supported model/feature' (🔵). This symbol was already in use in the support matrix, and this change clarifies its meaning for readers. The PR also corrects a minor formatting issue in the legend. The change is correct and improves the documentation's clarity.

As per the repository's style guide, here are suggestions for the pull request title and summary:

Suggested PR Title:

[Doc][BugFix] Add legend for experimental models in support matrix

Suggested PR Summary:

### What this PR does / why we need it?

This PR updates the `supported_models.md` documentation to include a legend entry for 'Experimental supported model/feature' (🔵).

This symbol is already used in the support matrix tables, but its definition was missing from the legend. Adding it improves the clarity and readability of the support matrix for users.

This change also corrects a minor formatting issue (extra space) for another legend item.

### Does this PR introduce _any_ user-facing change?

No, this is a documentation-only update and does not introduce any user-facing changes.

### How was this patch tested?

The change was visually verified by reviewing the rendered markdown file.