fix: remove merge conflict artifact in clinic-user-guide-for-tiup.md

[yahonda]

Remove a stray line with conflict markers in clinic-user-guide-for-tiup.md that was left behind from a merge conflict resolution.

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[gemini-code-assist]

Code Review

This pull request removes a line of placeholder progress characters (>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><>>>>>>>>>) from a bash command output block in the TiUP Clinic user guide (clinic/clinic-user-guide-for-tiup.md). There are no review comments, and I have no feedback to provide.

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[qiancai]

@yahonda It looks like the English file has the stray line too, so the stray line removed from PR might not be caused by merge conflict resolution.

https://github.com/pingcap/docs/blob/master/clinic/clinic-user-guide-for-tiup.md?plain=1