Fix typo in Wikipedia story

Author: tingshengtan

english/wikipedia/wiki.md

@@ -20,20 +20,20 @@ And you don't have to go to the library.
 
 [Behold!](http://en.wikipedia.org)
 
-You may also like it's sister site, wikiyoyage (https://www.wikivoyage.org)
+You may also like it's sister site, wikiyoyage (https://www.wikivoyage.org) 
 with more detailed information on travel destinations.
 
-You are so impressed with Wikipedia, you decide that you might even like to
+You are so impressed with Wikipedia, you decide that you might even like to 
 [donate](http://wikimediafoundation.org/wiki/Support_Wikipedia/en) some money to help keep Wikipedia running.
 
 Jimmy Wales would really appreciate the donation, since not everyone donates,
 but seemingly everyone makes use of Wikipedia!
 
 Until you get bored and go explore [here](https://www.urbandictionary.com) instead.
 
-Then after you explore the website, you learn a few neat tricks.
+Then after you explore the website, you learn a few neat tricks. 
 
-Then you want to show the world your new tricks by creating your own channel on [YouTube](https://www.youtube.com/).
+Then you want to show the world your new tricks by creating your own channel on [YouTube](https://www.youtube.com/). 
 
 [Play minecraft](../you-are-in-minecraft/minecraft.md)