tidb: add description for var tidb_ddl_reorg_max_write_speed
(#19445)#19646
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ti-chi-bot wants to merge 7 commits intopingcap:release-8.1from ti-chi-bot:cherry-pick-19445-to-release-8.1
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tidb_ddl_reorg_max_write_speed
(#19445)#19646