Add spacing between header comment and function

Author: braboj

examples/07_functions/func_positional_arguments.py

@@ -1,3 +1,8 @@
+# Demonstrates how functions receive arguments by their position
+# -----------------------------------------------------------------------------
+# Each value is matched to a parameter based on where it appears,
+# so the order of the provided arguments matters.
+
 def greet(name, age):
     print("Hello, {0}! You are {1} years old.".format(name, age))