release-8.5: doc updates for v8.5.6#21521

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hfxsd wants to merge 16 commits intorelease-8.5from

feature/preview-v8.5.6

Commits on Apr 2, 2026

Revert "Revert "v8.5.6 dashboard: Add note about prepared statements in Slow Query Detail (#21375)"" (#21493)
hfxsd
authored
Revert "Revert "v8.5.6: system-variables: add doc for `tidb_max_dist_… (#21494)
hfxsd
authored
Revert "Revert "[v8.5.6] docs: update sync-diff-inspector docs for mo… (#21495)
hfxsd
authored

Commits on Apr 3, 2026

resource_control: background control feature GA (#21506) (#21509)
ti-chi-bot
authored
sql: add note about table aliases in FOR UPDATE OF clause (#21489) (#21511)
ti-chi-bot
authored

Commits on Apr 9, 2026

Commits on Apr 11, 2026

statistics: deprecate stats v1 in 8.5 docs (#21476)
qiancai
authored