tidb-lightning: tidb.pd-addr supports multiple addresses

[hfxsd]

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What is the related PR or file link(s)?

• This PR is translated from:tidb-lightning: tidb.pd-addr supports multiple addresses docs-cn#16185
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
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• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[lance6716]

rest lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-15 06:01:59.942538334 +0000 UTC m=+162961.506836040: ☑️ agreed by lance6716.
• 2024-01-17 02:33:05.159983539 +0000 UTC m=+323226.724281244: ☑️ agreed by ran-huang.

[hfxsd]

/approve

[ti-chi-bot]

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