Update advanced guide 0304 (#1874)

* update_fluiddoc_1.7_0303,test=develop

* update_advanced_guide_0304,test=develop

doc/fluid/advanced_guide/flags/flags_cn.rst

@@ -7,11 +7,11 @@
     :maxdepth: 1
 
 
-    flags/cudnn_cn.rst
-    flags/data_cn.rst
-    flags/debug_cn.rst
-    flags/device_cn.rst
-    flags/distributed_cn.rst
-    flags/executor_cn.rst
-    flags/memory_cn.rst
-    flags/others_cn.rst
+    cudnn_cn.rst
+    data_cn.rst
+    debug_cn.rst
+    device_cn.rst
+    distributed_cn.rst
+    executor_cn.rst
+    memory_cn.rst
+    others_cn.rst

doc/fluid/advanced_guide/flags/flags_en.rst

@@ -7,14 +7,14 @@ FLAGS
     :maxdepth: 1
 
 
-    flags/cudnn_en.rst
-    flags/data_en.rst
-    flags/debug_en.rst
-    flags/device_en.rst
-    flags/distributed_en.rst
-    flags/executor_en.rst
-    flags/memory_en.rst
-    flags/others_en.rst
+    cudnn_en.rst
+    data_en.rst
+    debug_en.rst
+    device_en.rst
+    distributed_en.rst
+    executor_en.rst
+    memory_en.rst
+    others_en.rst