update doc

en/_sources/logger.md.txt

@@ -98,6 +98,10 @@ In the `appenders` section:
 
 #### View logger information for the special classloader
 
+Note that the hashcode changes, you need to check the current ClassLoader information first, and extract the hashcode corresponding to the ClassLoader.
+
+if you use`-c`, you have to manually type hashcode by `-c <hashcode>`.
+
 ```bash
 [arthas@2062]$ logger -c 2a139a55
  name                                   ROOT
@@ -125,6 +129,14 @@ In the `appenders` section:
                                         appenderRef     [APPLICATION]
 ```
 
+For classloader with only one instance, it can be specified by `--classLoaderClass` using class name, which is more convenient to use.
+
+`logger  --classLoaderClass sun.misc.Launcher$AppClassLoader`
+
+  * PS: Here the classLoaderClass in java 8 is sun.misc.Launcher$AppClassLoader, while in java 11 it's jdk.internal.loader.ClassLoaders$AppClassLoader.
+
+The value of `--classloaderclass` is the class name of classloader. It can only work when it matches a unique classloader instance. The purpose is to facilitate the input of general commands. However, `-c <hashcode>` is dynamic.
+
 #### Update logger level
 
 ```bash

en/_sources/sc.md.txt

@@ -18,6 +18,7 @@ sc
 |`[f]`|print the fields info of the current class, MUST be used with `-d` together|
 |`[x:]`|specify the depth of recursive traverse the static fields, the default value is '0' - equivalent to use `toString` to output|
 |`[c:]`|The hash code of the special class's classLoader|
+|`[classLoaderClass:]`| The class name of the ClassLoader that executes the expression. |
 |`[n:]`|Maximum number of matching classes with details (100 by default)|
 
 > *class-patten* supports full qualified class name, e.g. com.taobao.test.AAA and com/taobao/test/AAA. It also supports the format of 'com/taobao/test/AAA', so that it is convenient to directly copy class name from the exception stack trace without replacing '/' to '.'. <br/><br/>

en/_sources/sm.md.txt

@@ -17,6 +17,7 @@ sm
 |`[d]`|print the details of the method|
 |`[E]`|turn on regex matching while the default mode is wildcard matching|
 |`[c:]`|The hash code of the special class's classLoader|
+|`[classLoaderClass:]`| The class name of the ClassLoader that executes the expression. |
 |`[n:]`|Maximum number of matching classes with details (100 by default)|
 
 ### Usage