Fixed typos in tutorial

docs/tutorial/1-serialization.md

@@ -204,7 +204,7 @@ We can also serialize querysets instead of model instances.  To do so we simply
 
 ## Using ModelSerializers
 
-Our `SnippetSerializer` class is replicating a lot of information that's also contained in the `Snippet` model.  It would be nice if we could keep out code a bit  more concise.
+Our `SnippetSerializer` class is replicating a lot of information that's also contained in the `Snippet` model.  It would be nice if we could keep our code a bit  more concise.
 
 In the same way that Django provides both `Form` classes and `ModelForm` classes, REST framework includes both `Serializer` classes, and `ModelSerializer` classes.
 

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.