typo fix

docs/topics/3.0-announcement.md

@@ -323,7 +323,7 @@ Alternatively, specify the field explicitly on the serializer class:
 
 #### Fields for model methods and properties.
 
-With `ModelSerilizer` you can now specify field names in the `fields` option that refer to model methods or properties. For example, suppose you have the following model:
+With `ModelSerializer` you can now specify field names in the `fields` option that refer to model methods or properties. For example, suppose you have the following model:
 
     class Invitation(models.Model):
         created = models.DateTimeField()