Sync the two-fer exercise's docs with the latest data. (#814)

Author: ErikSchierboom

exercises/practice/two-fer/.docs/instructions.md

@@ -2,14 +2,13 @@
 
 Your task is to determine what you will say as you give away the extra cookie.
 
-If your friend likes cookies, and is named Do-yun, then you will say:
+If you know the person's name (e.g. if they're named Do-yun), then you will say:
 
 ```text
 One for Do-yun, one for me.
 ```
 
-If your friend doesn't like cookies, you give the cookie to the next person in line at the bakery.
-Since you don't know their name, you will say _you_ instead.
+If you don't know the person's name, you will say _you_ instead.
 
 ```text
 One for you, one for me.

exercises/practice/two-fer/.docs/introduction.md

@@ -5,4 +5,4 @@ Two-for-one is a way of saying that if you buy one, you also get one for free.
 So the phrase "two-fer" often implies a two-for-one offer.
 
 Imagine a bakery that has a holiday offer where you can buy two cookies for the price of one ("two-fer one!").
-You go for the offer and (very generously) decide to give the extra cookie to a friend.
+You take the offer and (very generously) decide to give the extra cookie to someone else in the queue.