add doc for tikv-client.enable-replica-selector-v2

[crazycs520]

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• This PR is translated from:add doc for tikv-client.enable-replica-selector-v2 docs-cn#16854
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[lilin90]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-20 06:30:37.057990672 +0000 UTC m=+1444664.080237100: ☑️ agreed by qiancai.
• 2024-03-21 09:28:04.65158645 +0000 UTC m=+1541711.673832839: ☑️ agreed by lilin90.

[qiancai]

/approve

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