[GHC] #13000: minor doc bug about list fusion in GHC user's guide

[GHC]

#13000: minor doc bug about list fusion in GHC user's guide
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        Reporter:  George            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Documentation     |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 Grepping through the git log (`-G RULES -p libraries/base` etc.) it seems
 that these functions recently became fusable, mostly due to work by David
 Feuer: `words`, `unwords`, `takeWhile`, `scanl`, `mapAccumL`, `scanr`,
 `mapMaybe`, `findIndices`, `unfoldr`, `filterM`, `foldl`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13000#comment:2>
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