Updated wiki docs in Type representation.

[Erik de Castro Lopo]

Hi all,

I was reading the GHC compiler commentary and the current GHC sources
and found that description here:

    http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/TypeType#TherepresentationofType	

did not match the code in Git.

I edited the wiki to the best of my ability but would appreciate it if
someone who understands this better could have a look over it hopefully
improve it.

Cheers,
Erik
-- 
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Erik de Castro Lopo
http://www.mega-nerd.com/