added doxygen file header

src/hci/mucurses/alert.c

 #include <curses.h>
 #include <vsprintf.h>
 
+/** @file
+ *
+ * MuCurses alert functions
+ *
+ */
+
 /**
  * Audible signal
  *

src/hci/mucurses/cursor.c

 #include <curses.h>
 #include "cursor.h"
 
+/** @file
+ *
+ * MuCurses cursor preserving functions
+ *
+ */
+
 /**
  * Restore cursor position from encoded backup variable
  *

src/hci/mucurses/cursor.h

 #ifndef CURSOR_H
 #define CURSOR_H
 
+/** @file
+ *
+ * MuCurses cursor implementation specific header file
+ *
+ */
+
 struct cursor_pos {
 	unsigned int y, x;
 };