cherry pick #4504 to release-4.0 (#4507)

Signed-off-by: ti-srebot <ti-srebot@pingcap.com> Co-authored-by: Feng Liyuan <darktemplar.f@gmail.com>
pingcap · Sep 15, 2020 · 9985e68 · 9985e68
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commit 9985e68
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diff --git a/functions-and-operators/aggregate-group-by-functions.md b/functions-and-operators/aggregate-group-by-functions.md
@@ -151,7 +151,6 @@ group by id, val;
 
 TiDB 目前不支持的聚合函数如下所示，相关进展参阅 [TiDB #7623](https://github.com/pingcap/tidb/issues/7623)。
 
-- `STD`, `STDDEV`, `STDDEV_POP`
 - `STDDEV_SAMP`
 - `VAR_SAMP`
 - `JSON_ARRAYAGG`