Seperate out the device demos and project's configuration descriptor structure definitions to clearly indicate what descriptors belong to which interface.

Demos/Device/ClassDriver/MassStorageKeyboard/Descriptors.h

@@ -66,9 +66,13 @@
 		typedef struct
 		{
 			USB_Descriptor_Configuration_Header_t Config;
+
+			// Mass Storage Interface
 			USB_Descriptor_Interface_t            MS_Interface;
 			USB_Descriptor_Endpoint_t             MS_DataInEndpoint;
 			USB_Descriptor_Endpoint_t             MS_DataOutEndpoint;
+
+			// Generic HID Interface
 			USB_Descriptor_Interface_t            HID_KeyboardInterface;
 			USB_HID_Descriptor_HID_t              HID_KeyboardHID;
 	        USB_Descriptor_Endpoint_t             HID_ReportINEndpoint;