Merge pull request #812 from dhepper/master

Fixed typos in tutorial

docs/tutorial/4-authentication-and-permissions.md

@@ -143,7 +143,7 @@ Once you've created a few code snippets, navigate to the '/users/' endpoint, and
 
 ## Object level permissions
 
-Really we'd like all code snippets to be visible to anyone, but also make sure that only the user that created a code snippet is able update or delete it.
+Really we'd like all code snippets to be visible to anyone, but also make sure that only the user that created a code snippet is able to update or delete it.
 
 To do that we're going to need to create a custom permission.