The `liferay-ui:page-iterator` taglib needs links with alternate text that is more descriptive so that they are accessible. Each page link is not descriptive enough outside the surrounding context.
Accessibility best practices states that, "Users of assistive technology may navigate to and activate links based on the name of the link and not based on the context of the link within content. Providing unique on-screen text or alternative text will ensure that users of assistive technology are able to distinguish different links from each other." https://www.webaccessibility.com/best_practices.php?best_practice_id=644