The validate-modules test in ansible-core devel has been updated in validate-modules: enforce FQCNs in seealso plugin/module entries by felixfontein · Pull Request #84325 · ansible/ansible · GitHub to ensure that plugin: and module: seealso fields in module/plugin documentation actually use FQCNs.
If you are a collection maintainer, you should run this on your collection to make sure that module/plugin seealso references are correct and result in usable links in the rendered documentation.