Need doc for Secret Manager v1beta2 API reference - Region specific secrets

Google Cloud Compute Infrastructure
1

Need API reference for Secret Manager v1beta2 APIs to create region specific secrets, it was visible 2 weeks ago at below link, but seems removed now. However, this feature is accessible via UI

https://cloud.google.com/secret-manager/docs/reference/rest/v1beta2/projects.locations.secrets/create