tiproxy: improve deployment instructions for deploying TiProxy (#19904)#19908

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ti-chi-bot wants to merge 1 commit intopingcap:release-8.1from ti-chi-bot:cherry-pick-19904-to-release-8.1

+131-7

Commits on Jan 7, 2025

This is an automated cherry-pick of pingcap#19904

djshow832
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ti-chi-bot
committed