[GHC] #11614: document TypeInType

[GHC]

#11614: document TypeInType
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           Reporter:  rwbarton       |             Owner:  goldfire
               Type:  task           |            Status:  new
           Priority:  highest        |         Milestone:  8.0.1
          Component:  Documentation  |           Version:  8.0.1-rc2
           Keywords:  TypeInType     |  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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 (Just to keep track of the status for 8.0.1.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11614>
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