fix: operators

Author: Chasen-Zhang

docs/en/sql-reference/10-sql-commands/30-query-operators/comparison.md

@@ -2,14 +2,14 @@
 title: Comparison Operators
 ---
 
-| Operator        | Description                                 | Example                     | Result |
-| --------------- | ------------------------------------------- | --------------------------- | ------ |
-| **=**           | a is equal to b                             | **2 = 2**                   | TRUE   |
-| **!=**          | a is not equal to b                         | **2 != 3**                  | TRUE   |
-| `**<\>**`       | a is not equal to b                         | `**2 <\> 2**`               | FALSE  |
-| **>**           | a is greater than b                         | **2 > 3**                   | FALSE  |
-| **>=**          | a is greater than or equal to b             | **4 >= NULL**               | NULL   |
-| `**<**`         | a is less than b                            | `**2 < 3**`                 | TRUE   |
-| `**<=**`        | a is less than or equal to b                | `**2 <= 3**`                | TRUE   |
-| **IS NULL**     | TRUE if expression is NULL, FALSE otherwise | **(4 >= NULL) IS NULL**     | TRUE   |
-| **IS NOT NULL** | FALSE if expression is NULL, TRUE otherwise | **(4 >= NULL) IS NOT NULL** | FALSE  |
+| Operator      | Description                                 | Example                   | Result |
+| ------------- | ------------------------------------------- | ------------------------- | ------ |
+| `=`           | a is equal to b                             | `2 = 2`                   | TRUE   |
+| `!=`          | a is not equal to b                         | `2 != 3`                  | TRUE   |
+| `<\>`         | a is not equal to b                         | `2 <\> 2`                 | FALSE  |
+| `>`           | a is greater than b                         | `2 > 3`                   | FALSE  |
+| `>=`          | a is greater than or equal to b             | `4 >= NULL`               | NULL   |
+| `<`           | a is less than b                            | `2 < 3`                   | TRUE   |
+| `<=`          | a is less than or equal to b                | `2 <= 3`                  | TRUE   |
+| `IS NULL`     | TRUE if expression is NULL, FALSE otherwise | `(4 >= NULL) IS NULL`     | TRUE   |
+| `IS NOT NULL` | FALSE if expression is NULL, TRUE otherwise | `(4 >= NULL) IS NOT NULL` | FALSE  |