Update Doxygen documentation configuration file for the main project...

Update Doxygen documentation configuration file for the main project documentation to the latest version. Add missing data structure documentation briefs.

LUFA/Drivers/Misc/RingBuffer.h

@@ -100,7 +100,9 @@
 		#include <LUFA/Common/Common.h>
 
 	/* Type Defines: */
-		/** Type define for a new ring buffer object. Buffers should be initialized via a call to
+		/** \brief Ring Buffer Management Structure.
+		 *
+		 *  Type define for a new ring buffer object. Buffers should be initialized via a call to
 		 *  \ref RingBuffer_InitBuffer() before use.
 		 */
 		typedef struct

LUFA/Drivers/USB/Class/Common/CDC.h

@@ -346,7 +346,9 @@
 			uint8_t bSlaveInterface0; /**< Interface number of the CDC Data interface. */
 		} USB_CDC_StdDescriptor_FunctionalUnion_t;
 		
-		/** Type define for a CDC Line Encoding structure, used to hold the various encoding parameters for a virtual
+		/** \brief CDC Virtual Serial Port Line Encoding Settings Structure.
+		 *
+		 *  Type define for a CDC Line Encoding structure, used to hold the various encoding parameters for a virtual
 		 *  serial port.
 		 */
 		typedef struct