[GHC] #9950: Documentation for InterruptibleFFI contains broken example

[GHC]

#9950: Documentation for InterruptibleFFI contains broken example
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        Reporter:  hpd               |                   Owner:  erdeszt
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Documentation     |                 Version:  7.8.4
      Resolution:                    |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D902
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Comment (by erdeszt):

 I've added the name sleepBlock that's how it's refered in the codebase
 (although with slightly different signature, not sure if it matters).
 I also see that the version says 7.8.4 but I've made my fix on the latest
 master. Is it my responsibility to add it to the older branches or is it
 done automatically? (Sorry, first  contribution and couldn't find relevant
 info in wiki)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9950#comment:4>
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