code: public Request delete(String roleId) {
      Asserts.assertNotNull(roleId, "role id");
  
      final String url = baseUrl
          .newBuilder()
          .addEncodedPathSegments("api/v2/roles")
          .addEncodedPathSegments(roleId)
          .build()
          .toString();
      VoidRequest request = new VoidRequest(this.client, url, "DELETE");
      request.addHeader("Authorization", "Bearer " + apiToken);
      return request;
    }
docs: Delete an existing Role.
  A token with scope delete:roles is needed.
  See https://auth0.com/docs/api/management/v2#!/Roles/delete_roles_by_id
  
  @param roleId The id of the role to delete.
  @return a Request to execute.