[GHC] #12536: Clarify commentary surrounding unboxed tuples and kind invariant

[GHC]

#12536: Clarify commentary surrounding unboxed tuples and kind invariant
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        Reporter:  bgamari           |                Owner:  simonpj
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"7187dedabec8e01394578c9f40241ca3d644a4f8/ghc"
 7187deda/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="7187dedabec8e01394578c9f40241ca3d644a4f8"
 Clarify comments on kinds (Trac #12536)

 - Remove misleading comments from TyCoRep.
 - Remove 'check_lifted' calls (which were no-ops) from TcValidity.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12536#comment:2>
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