Document parameter alias names

[scottkurz]

This isn't a huge deal but a more minor gap you might say in our overall doc story....

PROBLEM

In places like: https://github.com/OpenLiberty/ci.maven/blob/main/docs/common-parameters.md the doc assumes everyone's using the parameter aliases.

E.g. for this parameter:

    @Parameter(alias = "runtimeInstallDirectory", property = "runtimeInstallDirectory", defaultValue = "${project.build.directory}/liberty")
    protected File assemblyInstallDirectory;

we only document the "runtimeInstallDirectory" parameter...but this is just the alias.

OTOH, if you do:

• mvn liberty:help -Ddetail=true -Dgoal=start
• Do <Ctrl>+<Space> completion suggestion in Eclipse IDE in the pom.xml

you'll see the suggestion for the 'assemblyInstallDirectory' parameter instead. Trying to cross-reference this in the Markdown doc wouldn't be obvious.

ANOTHER IDEA

Just curious: have we ever looked at the plugin doc that the main Apache plugins use to generate plugin doc to see what it'd look like? Not saying we'd want to do a full "switch", just curious if some of this would be covered already if we were to make that available somehow?