Document any special tokens this field might use for itself.
Overrides FieldPluginBase::documentSelfTokens
addSelfTokens()
protected function documentSelfTokens(&$tokens) {
$tokens['[' . $this->options['id'] . '-tid' . ']'] = t('The taxonomy term ID for the term.');
$tokens['[' . $this->options['id'] . '-name' . ']'] = t('The taxonomy term name for the term.');
$tokens['[' . $this->options['id'] . '-vocabulary-vid' . ']'] = t('The machine name for the vocabulary the term belongs to.');
$tokens['[' . $this->options['id'] . '-vocabulary' . ']'] = t('The name for the vocabulary the term belongs to.');
}