Add doxygen image.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2319 bbd45198-f89e-11dd-88c7-29a3b14d5316

documentation/Doxyfile

@@ -746,7 +746,7 @@ EXAMPLE_RECURSIVE      = NO
 # directories that contain image that are included in the documentation (see 
 # the \image command).
 
-IMAGE_PATH             = ./images
+IMAGE_PATH             = ./doxygen
 
 # The INPUT_FILTER tag can be used to specify a program that doxygen should 
 # invoke to filter for each input file. Doxygen will invoke the filter program 

documentation/doxygen/filesystem.h

@@ -12,7 +12,7 @@
  * more concrete file system. The purpose of a VFS is to allow client applications
  * to access different types of concrete file systems in a uniform way.
  *
- * @image html dfs.png "Figure 2: Device Virtual File System Architecture"
+ * @image html dfs.png "Figure 4: Device Virtual File System Architecture"
  *
  * The DFS specifies an interface between the kernel and a concrete file system.
  * Therefore, it is easy to add support for new file system types to the kernel