[7.0] Possible webservices subsystem naming inconsistencies

As a follow up to JBEAP-6259, there are possible inconsistencies where `webservices` subsystem or Web Services subsystem can be used that and that need review from documentation team naming policy:

Deploying Red Hat JBoss Enterprise Application Platform on Amazon EC2
A.5.1. Web Services
... configuration files in the Web Services subsystem ...

Developing Web Services Applications
3.3.1. Consume and Access a JAX-WS Web Service
(web console contains "Web Services")... You can get this URL from the web services section of the Runtime section of the management console, after the endpoint is deployed. ...
(web console contains "Web Services")... Select the Runtime tab, select your server, then under Subsystems, select Webservices and click View. ...
3.4.5. Viewing Runtime Information
(web console contains "Web Services")... Select the applicable server, and select Subsystems → Webservices → View. ..