Update comprehension.rst

Author: fulv

week-05/code/comprehension.rst

@@ -99,7 +99,7 @@ https://github.com/gregmalcolm/python_koans/blob/master/python2/koans/about_comp
 =====================
 This is from CodingBat "count_evens" (http://codingbat.com/prob/p189616)
 
-*Using list comprehension*, Return the number of even ints in the given array. Note: the % "mod" operator computes the remainder, e.g. 5 % 2 is 1. 
+*Using list comprehension*, return the number of even ints in the given array. Note: the % "mod" operator computes the remainder, e.g. 5 % 2 is 1. 
 
     count_evens([2, 1, 2, 3, 4]) → 3