add fail_on_breaking to CLI

src/_help/continuous-integration/cli.md

@@ -247,6 +247,12 @@ _Note: you can also apply the overlay during the [`bump deploy` command](#bump-d
 bump deploy api-document.yaml --doc my-doc --token my-token --overlay overlay-file.yaml 
 ```
 
+### Optional imputs
+
+#### `fail_on_breaking`
+
+Mark the action as failed when a breaking change is detected with the diff command. This is only valid with diff command.
+
 ## Compatible specification types
 
 We currently support [OpenAPI](https://github.com/OAI/OpenAPI-Specification) from 2.0 (called Swagger) to 3.1 and [AsyncAPI 2.x](https://www.asyncapi.com/docs/reference/specification/latest) specification file types. Both YAML or JSON file formats are accepted file inputs to the CLI.