fix for loop slide

Author: lily-mara

slides/slides.rst

@@ -187,17 +187,6 @@ behavior by default.
 	<class 'object'>
 	50000
 
-Important to mention is that the variable created by the loop, in this
-case :python:`i`, is a *reference* to the location in the collection,
-so you can do this...
-
-.. code-block:: python
-
-	>>> for i in values:
-		i = 0
-	>>> print(values)
-	[0, 0, 0, 0]
-
 ===========
 While Loops
 ===========