Update 12 - Reversed Iteration.ipynb

Fix minor typo

Author: WillieMaddox

Part 2/Section 04 - Iterables and Iterators/12 - Reversed Iteration.ipynb

@@ -761,7 +761,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "In addition, we can override what is returned when the `reversed()` function is called on our custom sequence type. Here, I'll return a the list of the integers themselves instead of squares just to make this really stand out:"
+    "In addition, we can override what is returned when the `reversed()` function is called on our custom sequence type. Here, I'll return the list of the integers themselves instead of squares just to make this really stand out:"
    ]
   },
   {