remove duplicate XxxCacheFactory.java (#600)

XxxCacheFactory.java is duplicate, change XxxCacheFactory.java to XxxCache.java
diff --git a/docs/zh-cn/dev/impls/cache.md b/docs/zh-cn/dev/impls/cache.md
index 2b558d4..483b9c8 100644
--- a/docs/zh-cn/dev/impls/cache.md
+++ b/docs/zh-cn/dev/impls/cache.md
@@ -56,7 +56,7 @@
 }
 ```
 
-XxxCacheFactory.java:
+XxxCache.java:
 
 ```java
 package com.xxx;
@@ -80,4 +80,4 @@
 
 ```properties
 xxx=com.xxx.XxxCacheFactory
-```
\ No newline at end of file
+```