sys-var: clarify `tidb_slow_log_rules` syntax/behavior and de-duplicate slow log docs#21337

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zimulala wants to merge 7 commits intomasterfrom

docs/tidb_slow_log_rules-doc-improve-21324

Commits on Feb 9, 2026

Commits on Mar 10, 2026

*: tiny update
zimulala
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Update system-variables.md

zimulala
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hfxsd
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Commits on Mar 13, 2026

Add detailed tidb_slow_log_rules usage docs
hfxsd
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Commits on Mar 18, 2026