This doc looks wrong:

https://docs.wildfly.org/21/Developer_Guide.html#Remote_EJB_invocations_via_JNDI_-_EJB_client_API_or_remote-naming_project

AFAICT WildFly no longer ships org.jboss:jboss-remote-naming.

There are also a number of places where that doc refers to WildFly 21 which I believe is a dynamic value that is now incorrect. It's generally better to not include specific WildFly versions in the docs, as the URL for our docs already include a version number.