Fix missing _cn suffix for rand_like API doc (#7454)

Author: SigureMo

docs/api/paddle/rand_like.rst renamed to docs/api/paddle/rand_like_cn.rst

@@ -22,4 +22,4 @@ rand_like
 代码示例
 :::::::::::
 
-COPY-FROM: paddle.rand_like
+COPY-FROM: paddle.rand_like