USB_IsConnected is now cleared before the USB_Disconnect() event is fired in response to VBUS being removed.

Minor documentation improvements.

LUFA/Drivers/USB/HighLevel/USBInterrupt.c

@@ -89,6 +89,8 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 		}
 		else
 		{
+			USB_IsConnected = false;
+
 			EVENT_USB_Disconnect();
 		
 			USB_Detach();
@@ -96,8 +98,6 @@ ISR(USB_GEN_vect, ISR_BLOCK)
 			USB_PLL_Off();
 			USB_REG_Off();
 
-			USB_IsConnected = false;
-
 			EVENT_USB_VBUSDisconnect();
 			
 			USB_INT_Clear(USB_INT_VBUS);