Merge pull request #82 from Se3ek/typo-correction

typo in ex2_2

Exercises/ex2_2.md

@@ -167,7 +167,7 @@ as dictionaries like this:
 It would be a shame to do all of that work and then do nothing with
 the data.
 
-In this exercise, you task is this: write a program to answer the
+In this exercise, your task is this: write a program to answer the
 following three questions:
 
 1. How many bus routes exist in Chicago?

Exercises/ex2_5.md

@@ -206,7 +206,7 @@ into 4 separate `append()` operations.
 
 class RideData(collections.abc.Sequence):
     def __init__(self):
-        # Each value is a list with all of the values (a column)
+        # Each value is a list with all the values (a column)
         self.routes = []
         self.dates = []
         self.daytypes = []