[GHC] #10399: ApiAnnotations tweaks

[GHC]

#10399: ApiAnnotations tweaks
-------------------------------------+-------------------------------------
              Reporter:  alanz       |             Owner:  alanz
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:  7.10.2
             Component:  Compiler    |           Version:  7.10.1
              Keywords:              |  Operating System:  Unknown/Multiple
  ApiAnnotations                     |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
 A collection of minor updates for the API Annotations.

 1. The annotations for the RdrNames `(+)` and `(-)` are disconnected in
 the following

 {{{#!hs
 import GHC.TypeLits                   (KnownNat, type (+), type (-))
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10399>
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