Merge pull request #506 from er1z/master

--output parameter on api:swagger:export console

Author: dunglas

core/swagger.md

@@ -286,6 +286,9 @@ $ docker-compose exec php bin/console api:swagger:export
 
 $ docker-compose exec php bin/console api:swagger:export --yaml 
 # Swagger documentation in YAML format... 
+
+$ docker-compose exec php bin/console api:swagger:export --output=swagger_docs.json 
+# Swagger documentation dumped directly into JSON file (add --yaml to change format)
 ```
 
 ## Overriding the UI Template