Change xrange function to range function

Author: matheusfelipeog

docs/writing/style.rst

@@ -357,9 +357,7 @@ Instead, use a list comprehension:
 
 .. code-block:: python
 
-    four_lists = [[] for __ in xrange(4)]
-
-Note: Use range() instead of xrange() in Python 3.
+    four_lists = [[] for __ in range(4)]
 
 Create a string from a list
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~