clinic: update the clinic-user-guide-for-tiup

[Oreoxmt]

First-time contributors' checklist

• I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

• Update the get token media
• Modify the title to Troubleshoot TiDB Cluster Using PingCAP Clinic
• Fix typo

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• Delete files
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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[TomShawn]

LGTM

[Oreoxmt]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 0dc9bd6

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #9440.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #9441.