code: function tagName(tag, options) {
    if (tag == null || tag === '') {
      tag = options.defaultTag || 'Api';
    }
    tag = toIdentifier(tag);
    return tag.charAt(0).toUpperCase() + (tag.length == 1 ? '' : tag.substr(1));
  }
docs: Normalizes the tag name. Actually, capitalizes the given name.
  If the given tag is null, returns the default from options