tiflash: Add example of setting the tiflash-proxy configs

[JaySon-Huang]

What problem does this PR solve?

Finding out how to set the tiflash-proxy configs in tiup is hard.

What is changed and how it works?

Add example of setting the tiflash-proxy configs

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
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[JaySon-Huang]

/cc @CalvinNeo @xhebox

[ti-chi-bot]

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/cc @CalvinNeo @xhebox

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-07-24 10:23:58.110066509 +0000 UTC m=+1040660.101007978: ☑️ agreed by xhebox.

[ti-chi-bot]

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[CalvinNeo]

lgtm

[ti-chi-bot]

@CalvinNeo: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

lgtm

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[JaySon-Huang]

/retest

[JaySon-Huang]

/retest