code: public void deleteSSHKey(Integer targetUserId, Integer targetKeyId) throws IOException {
          String tailUrl = GitlabUser.USERS_URL + "/" + targetUserId + GitlabSSHKey.KEYS_URL + "/" + targetKeyId;
          retrieve().method(DELETE).to(tailUrl, Void.class);
      }
docs: Delete user's ssh key
  
  @param targetUserId The id of the Gitlab user
  @param targetKeyId  The id of the Gitlab ssh key
  @throws IOException on gitlab api call error