[Misc] fix typo in DCP comment

[Livinfly]

Purpose

1. fix typo

Test Plan

NA

Test Result

NA

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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.
• (Optional) Release notes update. If your change is user facing, please update the release notes draft in the Google Doc.

[github-actions]

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[gemini-code-assist]

Code Review

This pull request fixes a typo in a comment within vllm/v1/attention/backends/mla/common.py. The change is correct and improves code readability. I have reviewed the changes and found no high or critical issues to report.

[heheda12345]

@Livinfly can you fix the DCO failure with this guide? https://github.com/vllm-project/vllm/pull/28389/checks?check_run_id=54957388721

[Livinfly]

@Livinfly can you fix the DCO failure with this guide? https://github.com/vllm-project/vllm/pull/28389/checks?check_run_id=54957388721

@heheda12345 Apologies for the delay. The issue has been fixed.