Added better module summaries.

LUFA/Drivers/Peripheral/ADC.h

@@ -44,7 +44,9 @@
  *    - None
  *
  *  \section Module Description
- *  Functions, macros, variables, enums and types related to the setup of a the ADC subsystem.
+ *  Hardware ADC driver. This module provides an easy to use driver for the hardware
+ *  ADC present on many AVR models, for the conversion of analogue signals into the
+ *  digital domain.
  */
  
 #ifndef __ADC_H__

LUFA/Drivers/Peripheral/SPI.h

@@ -41,7 +41,8 @@
  *    - None
  *
  *  \section Module Description
- *  Functions, macros, variables, enums and types related to the setup of a the SPI port.
+ *  Driver for the hardware SPI port avaliable on most AVR models. This module provides
+ *  an easy to use driver for the setup of and transfer of data over the AVR's SPI port.
  *
  *  @{
  */

LUFA/Drivers/Peripheral/Serial.h

@@ -41,7 +41,8 @@
  *    - LUFA/Drivers/Peripheral/Serial.c
  *
  *  \section Module Description
- *  Functions, macros, variables, enums and types related to the setup of the USART for serial communications.
+ *  Hardware serial USART driver. This module provides an easy to use driver for
+ *  the setup of and transfer of data over the AVR's USART port.
  *
  *  @{
  */