[doc] Added header comments for lib modules

- common.c/.h
 - sg.c/.h
 - usb.c/.h

src/stlink-lib/common.c

@@ -1,3 +1,12 @@
+/* == nightwalker-87: TODO: CONTENT AND USE OF THIS SOURCE FILE IS TO BE VERIFIED (07.06.2023) == */
+/* TODO: This file should be split up into new or existing modules. */
+
+/*
+ * File: common.c
+ *
+ *
+ */
+
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>

src/stlink-lib/common.h

@@ -1,7 +1,10 @@
+/* == nightwalker-87: TODO: CONTENT AND USE OF THIS SOURCE FILE IS TO BE VERIFIED (07.06.2023) == */
+/* TODO: This file should be split up into new or existing modules. */
+
 /*
  * File: common.h
  *
- * General helper functions
+ *
  */
 
 #ifndef COMMON_H

src/stlink-lib/sg.c

@@ -1,3 +1,5 @@
+/* == nightwalker-87: TODO: CONTENT AND USE OF THIS SOURCE FILE IS TO BE VERIFIED (07.06.2023) == */
+
 /*
  * Copyright (c) 2010 "Capt'ns Missing Link" Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style

src/stlink-lib/sg.h

@@ -1,3 +1,5 @@
+/* == nightwalker-87: TODO: CONTENT AND USE OF THIS HEADER FILE IS TO BE VERIFIED (07.06.2023) == */
+
 /*
  * File: sg.h
  *

src/stlink-lib/usb.c

@@ -1,7 +1,7 @@
 /*
  * File: usb.c
  *
- * 
+ * USB commands & interaction with ST-LINK devices
  */
 
 #include <limits.h>

src/stlink-lib/usb.h

@@ -1,7 +1,7 @@
 /*
  * File: usb.h
  *
- * 
+ * USB commands & interaction with ST-LINK devices
  */
 
 #ifndef USB_H