Fixed incorrect signature in the CDC and DFU class bootloaders for the ATMEGA8U2.

Minor documentation cleanups.

Modify the incomplete AudioInputHost demo for mono audio output.

Demos/Host/Incomplete/AudioOutputHost/AudioOutputHost.c

@@ -218,6 +218,7 @@ void Audio_Task(void)
 			USB_HostState = HOST_STATE_Configured;
 			break;
 		case HOST_STATE_Configured:
+			/* Do nothing - audio stream is handled by the timer interrupt routine */
 			break;
 	}
 }