[GHC] #13791: Document allowed syntax in WARNING and DEPRECATED pragmas

[GHC]

#13791: Document allowed syntax in WARNING and DEPRECATED pragmas
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        Reporter:  phischu           |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  lowest            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.2
      Resolution:  fixed             |             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 bgamari):

 Merged to `ghc-8.2` as d8794aa582687846178a0b11604b736212cbf936.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13791#comment:3>
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