Lesson learned on how to make PRs against a Swagger UI repository.
You should not make the changes directly towards swagger-v2.json and swagger-v2.yaml files, or whatever the files with the final definitions are called.
As these files are automatically generated via the tooling.
You have to make the changes against the swagger/specs/index.spec.yaml file and then the changes will be reflected in swagger-v2.json and swagger-v2.yaml file, when the tools are run.
Thanks to my colleague Sumit for teaching me.