Fix missing briefs in the documentation for several modules, fix up invalid documentation references.

LUFA/DoxygenPages/Groups.txt

@@ -6,33 +6,33 @@
 
 /** \defgroup Group_BoardDrivers Board Drivers
  *
- *  Functions, macros, variables, enums and types related to the control of physical board hardware.
+ *  \brief Functions, macros, variables, enums and types related to the control of physical board hardware.
  */
 
 /** \defgroup Group_PeripheralDrivers On-chip Peripheral Drivers
  *
- *  Functions, macros, variables, enums and types related to the control of AVR subsystems.
+ *  \brief Functions, macros, variables, enums and types related to the control of AVR subsystems.
  */
 
 /** \defgroup Group_MiscDrivers Miscellaneous Drivers
  *
- *  Miscellaneous driver Functions, macros, variables, enums and types.
+ *  \brief Miscellaneous driver Functions, macros, variables, enums and types.
  */
 
 /** \defgroup Group_PlatformDrivers_AVR8 AVR8
  *  \ingroup Group_PlatformDrivers
  *
- *  Drivers relating to the AVR8 architecture platform, such as clock setup and interrupt management.
+ *  \brief Drivers relating to the AVR8 architecture platform, such as clock setup and interrupt management.
  */
 
 /** \defgroup Group_PlatformDrivers_XMEGA XMEGA
  *  \ingroup Group_PlatformDrivers
  *
- *  Drivers relating to the XMEGA architecture platform, such as clock setup and interrupt management.
+ *  \brief Drivers relating to the XMEGA architecture platform, such as clock setup and interrupt management.
  */
 
 /** \defgroup Group_PlatformDrivers_UC3 UC3
  *  \ingroup Group_PlatformDrivers
  *
- *  Drivers relating to the UC3 architecture platform, such as clock setup and interrupt management.
+ *  \brief Drivers relating to the UC3 architecture platform, such as clock setup and interrupt management.
  */

LUFA/Drivers/USB/Class/Device/HIDClassDevice.h

@@ -102,7 +102,7 @@
 					uint8_t  PrevReportINBufferSize; /**< Size in bytes of the given input report buffer. This is used to create a
 					                                  *  second buffer of the same size within the driver so that subsequent reports
 					                                  *  can be compared. If the user app is to determine when reports are to be sent
-					                                  *  exclusively (i.e. \ref PrevReportINBuffer is \c NULL) this value must still be
+					                                  *  exclusively (i.e. \c PrevReportINBuffer is \c NULL) this value must still be
 					                                  *  set to the size of the largest report the device can issue to the host.
 					                                  */
 				} Config; /**< Config data for the USB class interface within the device. All elements in this section

LUFA/Drivers/USB/USB.h

@@ -38,6 +38,8 @@
  */
 
 /** \defgroup Group_USB USB Core - LUFA/Drivers/USB/USB.h
+ *
+ *  \brief Core driver for the microcontroller hardware USB module
  *
  *  \section Sec_Dependencies Module Source Dependencies
  *  The following files must be built with any user project that uses this module:
@@ -72,6 +74,8 @@
  */
 
 /** \defgroup Group_USBClassDrivers USB Class Drivers
+ *
+ *  \brief Drivers for the various standardized USB device classes
  *
  *  Drivers for both host and device mode of the standard USB classes, for rapid application development.
  *  Class drivers give a framework which sits on top of the low level library API, allowing for standard