Fixing MegaMekLab's Javadoc Build

[Windchild292]

This continues on from MegaMek/megamek#3445 to fix the Javadoc build for MegaMekLab.

Akin to the previous one, there are still huge gaps in our Javadoc coverages, and tons of warnings.

[SJuliez]

All ok. I must say though that I find it greatly unappealing to always use @return and @param instead of real language and fail to see any advantage. In other words I am not aware that I was missing anything and so rather unwilling to change my comment practice.

[Windchild292]

It's for Javadoc parsing, as it creates the return and parameters setup in the Javadoc build. See below for an image showing why you want to use @param and @return.