[xmonad] Issue 502 in xmonad: Multihead trouble docs update -- xrandr required for proper display

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Comment #5 on issue 502 by MathStuf at gmail.com: Multihead trouble docs  
update -- xrandr required for proper display
http://code.google.com/p/xmonad/issues/detail?id=502

Ah, this might also be worth it to put on the wiki then.