reference: add a mysql system variable windowing_use_high_precision (#2145) #2179
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cherry-pick #2145 to release-4.0
What is changed, added or deleted? (Required)
add a mysql system variable windowing_use_high_precision
Which TiDB version(s) do your changes apply to? (Required)
What is the related PR or file link(s)?
pingcap/tidb#15606
pingcap/tidb#14887
This PR is translated from pingcap/docs-cn#2607.