code: public function hint($content, $options = [])
      {
          if ($content === false) {
              $this->parts['{hint}'] = '';
              return $this;
          }
  
          $options = array_merge($this->hintOptions, $options);
          if ($content !== null) {
              $options['hint'] = $content;
          }
          $this->parts['{hint}'] = Html::activeHint($this->model, $this->attribute, $options);
  
          return $this;
      }
docs: Renders the hint tag.
  @param string|bool $content the hint content.
  If `null`, the hint will be generated via [[Model::getAttributeHint()]].
  If `false`, the generated field will not contain the hint part.
  Note that this will NOT be [[Html::encode()|encoded]].
  @param array $options the tag options in terms of name-value pairs. These will be rendered as
  the attributes of the hint tag. The values will be HTML-encoded using [[Html::encode()]].
  
  The following options are specially handled:
  
  - `tag`: this specifies the tag name. If not set, `div` will be used.
  See also [[\yii\helpers\Html::tag()]].
  
  @return $this the field object itself.