Update documentation to reflect the JEE servers supported today

[ddelponte]

This issue is releated to grails/grails-core#11021

Update the documents at http://docs.grails.org/3.3.4/guide/single.html#supportedJavaEEContainers to reflect which JEE servers we currently support.

As stated in the linked issue:

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Issue grails/grails-core#11021

• I have confirmed that a grails-3.3.5 helloworld app deploys and renders pages without incident on the following JEE servers:
  • WildFly 13
  • Payara 5
  • Glassfish 5
• Deployment fails on Glassfish 4
  • Glassfish 4
    • Same war file will not deploy to Glassfish 4
    • Modifying build.gradle by adding compile "org.springframework.batch:spring-batch-core:2.2.7.RELEASE" results in a deployable war file
    • Although the war file will deploy, all requests are responded to with a 404. No pages render

How to build a deployable war file

• To build a war file that will deploy on Wildfly 13, Payara 5 and Glassfish 5, modify the following line in build.gradle:

compile "org.springframework.boot:spring-boot-starter-tomcat" 

to

provided "org.springframework.boot:spring-boot-starter-tomcat"