modify the doc of comment (#564)

Co-authored-by: dengn <[email protected]>

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

@@ -56,56 +56,44 @@ MatrixOne supports three comment styles:
    1 row in set (0.01 sec)
    ```
 
-## MySQL-compatible comment syntax
+## MatrixOne specific comment syntax
 
-The same as MySQL, MatrixOne supports a variant of C comment style:
+- MatrixOne supports C comment style as below:
 
 ```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)
 ```
 
 Or:
 
 ```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 specific comment syntax
-
-MatrixOne supports a variant of C comment style:
+- MatrixOne dose not support C comment style as below:
 
 ```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";
 ```
 
 Or:
 
 ```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";
 ```
 
 ## Constraints