qtvcp -docs: update user command recommended code layout

Author: c-morley

docs/src/gui/qtvcp.adoc

@@ -285,6 +285,10 @@ Here we show how to add new functions and override existing ones.
 # reference: https://ruivieira.dev/python-monkey-patching-for-readability.html
 import types
 
+# import the handlerfile to get reference to it's libraries
+# use <screenname>_handler
+import qtdragon_handler as hdlr
+
 # This is actually an unbounded function with 'obj' as a parameter.
 # You call this function without the usual preceding 'self.'
 # This is because will will not be patching it into the original handler class instance
@@ -309,9 +313,9 @@ def on_keycall_F11(self,event,state,shift,cntrl):
         print ('Hello')
 
 # We are referencing the KEYBIND library that was instantiated in the 
-# original handler class instance by adding 'self.' to it.
+# original handler class instance by adding 'hdlr.' to it (from the imp).
 # This function tells KEYBIND to call 'on_keycall_F10' when F10 is pressed
-self.KEYBIND.add_call('Key_F10','on_keycall_F10')
+hdlr.KEYBIND.add_call('Key_F10','on_keycall_F10')
 
 # Here we are instance patching the original handler file to add a new
 # function that calls our new function (of the same name)