update MD by dispatch event pingcap/docs release-8.1

Author: github-actions

markdown-pages/en/tidb/release-8.1/sql-mode.md

@@ -53,6 +53,6 @@ In this statement, `modes` is a set of modes separated by commas (','). You can
 | `MAXDB` | Equivalent to `PIPES_AS_CONCAT`, `ANSI_QUOTES`, `IGNORE_SPACE`, `NO_KEY_OPTIONS`, `NO_TABLE_OPTIONS`, `NO_FIELD_OPTIONS`, `NO_AUTO_CREATE_USER` (full support)|
 | `MySQL323` | Equivalent to `NO_FIELD_OPTIONS`, `HIGH_NOT_PRECEDENCE` (syntax support only)|
 | `MYSQL40` | Equivalent to `NO_FIELD_OPTIONS`, `HIGH_NOT_PRECEDENCE` (syntax support only)|
-| `ANSI` | Equivalent to `REAL_AS_FLOAT`, `PIPES_AS_CONCAT`, `ANSI_QUOTES`, `IGNORE_SPACE` (syntax support only)|
+| `ANSI` | Equivalent to `REAL_AS_FLOAT`, `PIPES_AS_CONCAT`, `ANSI_QUOTES`, `IGNORE_SPACE`, `ONLY_FULL_GROUP_BY` (syntax support only)|
 | `TRADITIONAL` | Equivalent to `STRICT_TRANS_TABLES`, `STRICT_ALL_TABLES`, `NO_ZERO_IN_DATE`, `NO_ZERO_DATE`, `ERROR_FOR_DIVISION_BY_ZERO`, `NO_AUTO_CREATE_USER` (syntax support only) |
 | `ORACLE` | Equivalent to `PIPES_AS_CONCAT`, `ANSI_QUOTES`, `IGNORE_SPACE`, `NO_KEY_OPTIONS`, `NO_TABLE_OPTIONS`, `NO_FIELD_OPTIONS`, `NO_AUTO_CREATE_USER` (syntax support only)|