Not all migration warnings are listed in A.3. Web Subsystem Migration Operation Warnings (migration guide in revision 7907913).

Not sure whether there is goal to list all of them, still there should be listed rather some from general configuration than the ones from valves. As using configuration from general configuration parts is most likely related to more customers.

Listing some of the migration warnings which are missing:
RemoteIpValve: WFLYWEB0009: Could not migrate attribute protocolHeaderHttpsValue from valve

webdav and static resources:
WFLYWEB0003: Could not migrate attribute webdav from resource
WFLYWEB0003: Could not migrate attribute secret from resource
WFLYWEB0003: Could not migrate attribute read-only from resource
WFLYWEB0003: Could not migrate attribute max-depth from resource
WFLYWEB0003: Could not migrate attribute disabled from resource
WFLYWEB0003: Could not migrate attribute file-encoding from resource
WFLYWEB0003: Could not migrate attribute sendfile from resource

sso
WFLYWEB0003: Could not migrate attribute reauthenticate from resource
WFLYWEB0003: Could not migrate attribute cache-name from resource
WFLYWEB0003: Could not migrate attribute cache-container from resource

http connector related
WFLYWEB0003: Could not migrate attribute redirect-port from resource
WFLYWEB0003: Could not migrate attribute proxy-binding from resource
WFLYWEB0003: Could not migrate attribute executor from resource

ssl configuration for https connector
WFLYWEB0003: Could not migrate attribute certificate-file from resource
WFLYWEB0003: Could not migrate attribute ssl-protocol from resource
WFLYWEB0003: Could not migrate attribute ca-revocation-url from resource