1. Define useful attributes for common strings related to "Eclipse Che Hosted By Red Hat".
2. Add Vale rules promoting the change
3. Use the attributes in the documentation.

First, get some agreement on the attributes:

developer-sandbox-name:  Developer Sandbox for Red Hat OpenShift
developer-sandbox-url: https://developers.redhat.com/developer-sandbox
hosted-che-name: Eclipse Che H

Document the commands that clients should implement and their expected behaviour on https://github.com/eclipse/eclipse.jdt.ls/wiki/JDT-LS-Extensions

Consider the following:

void meth(Closure closure) {
  closure.|
}

When invoking content assist (Ctrl+Space) at |, the methods and properties of groovy.lang.Closure are very low in the list of proposals. This is due to very-well-known type adjustments made within org.codehaus.groovy.eclipse.codeassist.proposals.AbstractGroovyProposal.getRelevanceClass().