fixed decorator example

FreekKalter · FreekKalter · commit 96018a353299 · 2015-08-25T23:28:15.000+02:00
In the function to wrap, we print a string. In the decorator we return a string.
Better to change them both to returning a string, since you're printing what it returns.
diff --git a/decorators.rst b/decorators.rst
@@ -251,7 +251,7 @@ decorators.
 
     @decorator_name
     def func():
-        print("Function is running")
+        return("Function is running")
 
     can_run = True
     print(func())
