[xmonad] Issue 182 in xmonad: Key bindings should be showable

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Comment #8 on issue 182 by daniel.s... at gmail.com: Key bindings should be  
showable
http://code.google.com/p/xmonad/issues/detail?id=182

I don't think that gwern suggested to bind it to shift+xK_slash, he just  
checked to see if someone bound '?' "indirectly" instead of using just  
xK_question, which would probably work on all layouts with a question mark.