[Doc] Fix typo in llm-d documentation link

[woernfl]

Purpose

Fix a typo in a link to the llm-d documentation website.

Test Plan

In my opinion, not applicable.

Test Result

In my opinion, not applicable.

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

[claude]

Claude Code Review

This pull request is from a fork — automated review is disabled. A repository maintainer can comment @claude review to run a one-time review.

[github-actions]

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[mergify]

Documentation preview: https://vllm--42397.org.readthedocs.build/en/42397/

[gemini-code-assist]

Code Review

This pull request updates the documentation for the llm-d integration by correcting the link and text from "this guide" to "this guides". I have no feedback to provide as there are no review comments.