Add Mhelp information to the game startup text

As of now I’m not completely sure that there’s a non IC way (besides the discord, or random UI exploration) that points out how to mhelp. So I suggest adding the info that we have staff willing to answer questions about game mechanics, and also the appropriate hotkey to the startup text that happens on login. I think it’ll benefit the game by allowing interns easier access to people who will actually help them play the game.

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That only shows for assistants though; new players might not see it if they pick a different role