cherry pick #3912 to release-4.0 (#3914)

Signed-off-by: ti-srebot <ti-srebot@pingcap.com> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com>
pingcap · Sep 15, 2020 · fdd9242 · fdd9242
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commit fdd9242
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diff --git a/functions-and-operators/aggregate-group-by-functions.md b/functions-and-operators/aggregate-group-by-functions.md
@@ -117,7 +117,6 @@ group by id, val;
 
 The following aggregate functions are currently unsupported in TiDB. You can track our progress in [TiDB #7623](https://github.com/pingcap/tidb/issues/7623):
 
-- `STD`, `STDDEV`, `STDDEV_POP`
 - `STDDEV_SAMP`
 - `VAR_SAMP`
 - `JSON_ARRAYAGG`