docs: update r8-proguard

Author: fankes

docs-source/src/en/config/r8-proguard.md

@@ -3,4 +3,15 @@
 > In most scenarios, Android application installation packages can reduce size through obfuscation.
 > Here is a configuration method for obfuscation rules.
 
-`KavaRef` does not require any additional configuration of obfuscation rules in Android projects.
+If you are using the [kavaref-extension](../library/kavaref-extension) module and using the `TypeRef` feature, please add the following rule to your `proguard-rules.pro` file.
+
+```
+-keepattributes Signature
+```
+
+`TypeRef` has been annotated with `Keep`. If it doesn't work, please manually add the following rules to keep the class.
+
+```
+-keep class com.highcapable.kavaref.extension.TypeRef {*;}
+-keep class,allowobfuscation * extends com.highcapable.kavaref.extension.TypeRef
+```

docs-source/src/zh-cn/config/r8-proguard.md

@@ -2,4 +2,15 @@
 
 > 大部分场景下 Android 应用程序安装包可通过混淆压缩体积，这里介绍了混淆规则的配置方法。
 
-`KavaRef` 在 Android 项目中不需要额外配置任何混淆规则。
+如果你使用了 [kavaref-extension](../library/kavaref-extension) 模块，并使用了其中的 `TypeRef` 功能，请在你的 `proguard-rules.pro` 文件中添加以下规则。
+
+```
+-keepattributes Signature
+```
+
+`TypeRef` 已添加 `Keep` 注解，如果无效，请手动添加以下规则以保留类。
+
+```
+-keep class com.highcapable.kavaref.extension.TypeRef {*;}
+-keep class,allowobfuscation * extends com.highcapable.kavaref.extension.TypeRef
+```