The Getting Started Guide has some very brief discussion of JDK support:

https://docs.wildfly.org/22/Getting_Started_Guide.html#requirements

Add something a bit fuller to https://docs.wildfly.org/22/Installation_Guide.html. Something that covers more of what I say about JDK support in my WildFly release announcements, e.g.

https://www.wildfly.org/news/2021/01/13/WildFly22-Final-Released/