A little more self service in the borg chargers

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Dropping a "Guide to Robot Maintenance" in Robotics seems like an elegant solution, along with having it a bit more responsive about what you're doing wrong. The reason nobody knows how to do manual robot maintenance isn't because it's so complex, it's because it's not documented or explained anywhere ingame, and it's easy to miss on the one wiki page that explains it since limb replacement is hidden away under the heading "Chassis Changes".