Move documentation from NodeInfo into the API docs.

* Delete the docs from NodeInfo.cpp and NodeInfo.h
* I snuck a couple of style fixes into NodeInfo.cpp
* I had to make a small modification to MimeType.dox to prevent it
  from overriding the docs of one of the methods in NodeInfo.dox.

headers/os/storage/NodeInfo.h

@@ -18,11 +18,6 @@ class BBitmap;
 class BResources;
 
 
-/*!	\brief BNodeInfo provides file type information
-	BNodeInfo provides a nice wrapper to all sorts of usefull meta data. 
-	Like it's mime type, the files icon and the application which will load
-	the file.
-*/
 class BNodeInfo {
 public:
 								BNodeInfo();