* supports those.
*
* @param array $articles
- * @param array $articles_start_char
+ * @param string[] $articles_start_char
* @return string
* @private
*/
/**
* Format a list of articles chunked by letter in a bullet list.
* @param array $articles
- * @param array $articles_start_char
+ * @param string[] $articles_start_char
* @return string
* @private
*/