update comment

Qt_EQL/tutorial/test.lisp

@@ -1,6 +1,11 @@
 ;;; below function calls only work because 'define-qt-wrappers' has already
 ;;; been called implicitely on '*test*', see 'EQL::addObject()' in 'main.cpp'
 ;;; (note third argument 'true')
+;;;
+;;; Qt function names are translated to Lisp names like this:
+;;;   Qt:            Lisp:
+;;;   newInstance()  (new-instance)
+;;;   doIOStuff()    (do-i-o-stuff)
 
 (defun test ()
   ;; make new instance