Fix typo

docs/topics/3.1-announcement.md

@@ -110,7 +110,7 @@ When per-request internationalization is enabled, client requests will respect t
         "detail": "No se ha podido satisfacer la solicitud de cabecera de Accept."
     }
 
-Note that the structure of the error responses is still the same. We still have a `details` key in the response. If needed you can modify this behavior too, by using a [custom exception handler][custom-exception-handler].
+Note that the structure of the error responses is still the same. We still have a `detail` key in the response. If needed you can modify this behavior too, by using a [custom exception handler][custom-exception-handler].
 
 We include built-in translations both for standard exception cases, and for serializer validation errors.