Update exceptions.md (#9071)

Author: rexes-aka

docs/api-guide/exceptions.md

@@ -101,7 +101,7 @@ Note that the exception handler will only be called for responses generated by r
 
 The **base class** for all exceptions raised inside an `APIView` class or `@api_view`.
 
-To provide a custom exception, subclass `APIException` and set the `.status_code`, `.default_detail`, and `default_code` attributes on the class.
+To provide a custom exception, subclass `APIException` and set the `.status_code`, `.default_detail`, and `.default_code` attributes on the class.
 
 For example, if your API relies on a third party service that may sometimes be unreachable, you might want to implement an exception for the "503 Service Unavailable" HTTP response code.  You could do this like so: