fix definition (#21110)

Author: solankisamir

specification/apimanagement/resource-manager/Microsoft.ApiManagement/preview/2022-04-01-preview/apimauthorizationproviders.json

@@ -508,7 +508,7 @@
             "description": "Authorization was successfully deleted."
           },
           "204": {
-            "description": "The authorization server settings were successfully deleted."
+            "description": "The authorization resource was not found."
           },
           "default": {
             "description": "Error response describing why the operation failed.",