There is nothing special about link-checking in xowiki. There is no extra built-in support for link-checking, but there are many link-checkers out there, which might be used. One option (especially for public content) is [1]: it finds e.g. 223 broken links on 972 web pages on www.project-open.com
-gn
[1] https://www.brokenlinkcheck.com/broken-links.php