tiup-playground: add info about TiProxy (#19769)#19771

Merged

ti-chi-bot[bot] merged 4 commits intopingcap:release-8.1from ti-chi-bot:cherry-pick-19769-to-release-8.1

Dec 24, 2024

+35

Commits on Dec 23, 2024

This is an automated cherry-pick of pingcap#19769

qiancai
authored and
ti-chi-bot
committed
Update tiup-playground.md
qiancai
authored
Update tiup-playground.md
qiancai
authored

Commits on Dec 24, 2024

Update tiup/tiup-playground.md
qiancai
authored