modify the doc of comment (#799)

docs/MatrixOne/Reference/Language-Structure/comment.md

@@ -56,58 +56,46 @@ MatrixOne 支持以下注释格式：
    1 row in set (0.01 sec)
    ```
 
-## MySQL 兼容的注释语法
+## MatrixOne 可执行的注释语法
 
-MatrixOne 也跟 MySQL 保持一致，支持 C 语言注释格式：
+- MatrixOne 支持 C 语言注释格式：
 
 ```sql
-mysql> select 100 /*! Specific code */ -99;
+mysql> select 100-99;   // This comment continues to the end of line
 +----------+
 | 100 - 99 |
 +----------+
 |        1 |
 +----------+
-1 row in set (0.02 sec)
+1 row in set (0.03 sec)
 ```
 
 或：
 
 ```sql
-mysql> select 100 /*!50110 Specific code */ -99;
+mysql> // This comment continues to the line
+    -> select 100-99;
 +----------+
 | 100 - 99 |
 +----------+
 |        1 |
 +----------+
-1 row in set (0.02 sec)
 ```
 
-## MatrixOne 可执行的注释语法
-
-MatrixOne 还支持另一种 C 语言注释格式：
+- MatrixOne 不支持的 C 语言注释格式：
 
 ```sql
-mysql> select 100-99;   // This comment continues to the end of line
-+----------+
-| 100 - 99 |
-+----------+
-|        1 |
-+----------+
-1 row in set (0.03 sec)
+mysql> select 100 /*! Specific code */ -99;
+ERROR 1064 (HY000): SQL parser error: You have an error in your SQL syntax; check the manual that corresponds to your MatrixOne server version for the right syntax to use. syntax error at line 1 column 28 near " code */ -99";
 ```
 
 或：
 
 ```sql
-mysql> // This comment continues to the line
-    -> select 100-99;
-+----------+
-| 100 - 99 |
-+----------+
-|        1 |
-+----------+
+mysql> select 100 /*!50110 Specific code */ -99;
+ERROR 1064 (HY000): SQL parser error: You have an error in your SQL syntax; check the manual that corresponds to your MatrixOne server version for the right syntax to use. syntax error at line 1 column 33 near " code */ -99";
 ```
 
 ## 限制
 
-MatrixOne 暂不支持嵌套注释。
+- MatrixOne 暂不支持嵌套注释。