Fix typo.

docs/api-guide/serializers.md

@@ -344,7 +344,7 @@ Here's an example for an `update()` method on our previous `UserSerializer` clas
 
             return instance
 
-Because the behavior of nested creates and updates can be ambiguous, and may require complex dependancies between related models, REST framework 3 requires you to always write these methods explicitly. The default `ModelSerializer` `.create()` and `.update()` methods do not include support for writable nested representations.
+Because the behavior of nested creates and updates can be ambiguous, and may require complex dependencies between related models, REST framework 3 requires you to always write these methods explicitly. The default `ModelSerializer` `.create()` and `.update()` methods do not include support for writable nested representations.
 
 It is possible that a third party package, providing automatic support some kinds of automatic writable nested representations may be released alongside the 3.1 release.