fix doc

site/src/site/sphinx/advanced-use.md

@@ -6,7 +6,7 @@
 
 * help——查看命令帮助信息
 * [cat](cat.md)——打印文件内容，和linux里的cat命令类似
-* [grep]](grep.md)——匹配查找，和linux里的grep命令类似
+* [grep](grep.md)——匹配查找，和linux里的grep命令类似
 * [pwd](pwd.md)——返回当前的工作目录，和linux命令类似
 * cls——清空当前屏幕区域
 * session——查看当前会话的信息

site/src/site/sphinx/en/advanced-use.md

@@ -6,7 +6,7 @@ Advanced Usage
 * help - display Arthas help
 * cls - clear the screen
 * [cat](cat.md) - Concatenate and print files
-* [grep]](grep.md) - Pattern searcher
+* [grep](grep.md) - Pattern searcher
 * [pwd](pwd.md) - Return working directory name
 * session - display current session information
 * [reset](reset.md) - reset all the enhanced classes. All enhanced classes will also be reset when Arthas server is closed by `stop/shutdown`

site/src/site/sphinx/en/grep.md

@@ -1,4 +1,4 @@
-Grep
+grep
 ===
 
 > Similar to the traditional `grep` command.

site/src/site/sphinx/grep.md

@@ -1,4 +1,4 @@
-Grep
+grep
 ===
 
 > 类似传统的`grep`命令。