[GHC] #11614: document TypeInType

[GHC]

#11614: document TypeInType
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        Reporter:  rwbarton          |                Owner:  goldfire
            Type:  task              |               Status:  patch
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Documentation     |              Version:  8.0.1-rc2
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1995
       Wiki Page:                    |
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Comment (by goldfire):

 More on the way, according to Phab:D1995.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11614#comment:3>
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