Update c09_functions.py (alexmojaki#500)

Verbose instruction

Author: DarpNagarsheth

core/chapters/c09_functions.py

@@ -200,7 +200,7 @@ def print_twice(x: str):
 
     class print_many(VerbatimStep):
         """
-Functions can have many parameters. Here's an example:
+Functions can have many parameters. Try the below example:
 
 __program_indented__
 """