[GHC] #10392: typo in Debug.Trace.traceShowM example

[GHC]

#10392: typo in Debug.Trace.traceShowM example
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              Reporter:  sebastian   |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  low         |         Milestone:
             Component:              |           Version:  7.10.1
  Documentation                      |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  Documentation
          Architecture:              |  bug
  Unknown/Multiple                   |        Blocked By:
             Test Case:              |   Related Tickets:
              Blocking:              |
Differential Revisions:              |
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 s/traceMShow/traceShowM

 The documentation for Debug.Trace.traceShowM has an example, where the
 function is called traceMShow instead of the correct traceShowM.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10392>
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