Doxygenize the unaltered comments for the AUHeaders structure.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@8249 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/rtp.h

@@ -72,7 +72,7 @@ typedef struct rtp_payload_data_s
     int objecttype;
     char *mode;
 
-    /* mpeg 4 AU headers */
+    /** mpeg 4 AU headers */
     struct AUHeaders {
         int size;
         int index;