docs:add description for \x

docs/en/12-taos-sql/18-escape.md

@@ -22,5 +22,5 @@ description: This document describes the usage of escape characters in TDengine.
    - Identifier without ``: Error will be returned because identifier must be constituted of digits, ASCII characters or underscore and can't be started with digits
    - Identifier quoted with ``: Original content is kept, no escaping
 2. If there are escape characters in values
-   - The escape characters will be escaped as the above table. If the escape character doesn't match any supported one, the escape character "\" will be ignored.
-   - "%" and "\_" are used as wildcards in `like`. `\%` and `\_` should be used to represent literal "%" and "\_" in `like`,. If `\%` and `\_` are used out of `like` context, the evaluation result is "`\%`"and "`\_`", instead of "%" and "\_".
+   - The escape characters will be escaped as the above table. If the escape character doesn't match any supported one, the escape character \ will be ignored(\x remaining).
+   - "%" and "\_" are used as wildcards in `like`. `\%` and `\_` should be used to represent literal "%" and "\_" in `like`. If `\%` and `\_` are used out of `like` context, the evaluation result is "`\%`"and "`\_`", instead of "%" and "\_".

docs/zh/12-taos-sql/18-escape.md

@@ -17,7 +17,6 @@ description: TDengine 中使用转义字符的详细规则
 |   `\%`   | % 规则见下     |
 |   `\_`   | \_ 规则见下    |
 
-:::
 
 ## 转义字符使用规则
 
@@ -25,5 +24,5 @@ description: TDengine 中使用转义字符的详细规则
    1. 普通标识符： 直接提示错误的标识符，因为标识符规定必须是数字、字母和下划线，并且不能以数字开头。
    2. 反引号``标识符： 保持原样，不转义
 2. 数据里有转义字符
-   1. 遇到上面定义的转义字符会转义（%和\_见下面说明），如果没有匹配的转义字符会忽略掉转义符\。
-   2. 对于%和\_，因为在 like 里这两个字符是通配符，所以在模式匹配 like 里用`\%`%和`\_`表示字符里本身的%和\_，如果在 like 模式匹配上下文之外使用`\%`或`\_`，则它们的计算结果为字符串`\%`和`\_`，而不是%和\_。
+   1. 遇到上面定义的转义字符会转义（%和\_见下面说明），如果没有匹配的转义字符会忽略掉转义符\（\x保持原样）。
+   2. 对于%和\_，因为在 like 里这两个字符是通配符，所以在模式匹配 like 里用`\%`和`\_`表示字符里本身的%和\_，如果在 like 模式匹配上下文之外使用`\%`或`\_`，则它们的计算结果为字符串`\%`和`\_`，而不是%和\_。