Document the webModuleClassPathLoader attribute for class loading

[tjwatson]

The auto-generated documentation for the enterpriseApplication will contain the following descriptions for the new webModuleClassPathLoader attribute:

Name: webModuleClassPathLoader
Type: war or ear
Default: war
Description:

This attribute defines the class loader that is used for JARs that are referenced by web application Class-Path headers.
war
Use the web application class loader for the JARs that are referenced by a web application Class-Path header.
ear
Use the parent enterprise application class loader for the JARs that are referenced by a web application Class-Path header.

We should consider adding a new section to the Class loader configuration page that gives more details like the beta-blog did for the option:

[dmuelle]

for epic OpenLiberty/open-liberty#28110

[dmuelle]

moved to WL backlog