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tidb: update tidb_index_serial_scan_concurrency docs#21938

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ti-chi-bot[bot] merged 25 commits into

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Jul 14, 2026

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tidb: update tidb_index_serial_scan_concurrency docs#21938
ti-chi-bot[bot] merged 25 commits into
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0xPoe:poe-patch-update-vars

minor wording updates

20feb53

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