Shorten the doxygen for method t() in ControllerBase to the standard version

per #2018411: Figure out a nice DX when working with injected translation the doxygen on the t() method should be just:

  /**
   * Translates a string to the current language or to a given language.
   *
   * See the t() documentation for details.
   */
  protected function t($string, array $args = array(), array $options = array()) {
    return $this->stringTranslation->translate($string, $args, $options);
  }