add patch and delete methods

docs/api/v2/README.md

@@ -73,7 +73,7 @@ The status codes are:
 * **304**: In case the resource was not modified, contains no response body
 * **403**: ownCloud Error: The provided authorization headers are invalid. No **error** object is available.
 * **404**: ownCloud Error unless specified otherwise: The route can not be found. This can happen if the app is disabled or because of other reasons. No **error** object is available.
-* **4xx**: There was an app related error, check the **error** object
+* **4xx**: There was an app related error, check the **error** object if specified
 * **5xx**: ownCloud Error: A server error occurred. This can happen if the server is in maintenance mode or because of other reasons. No **error** object is available.
 
 The response headers are: