[GHC] #9937: add updated prefetch API mention to the 7.10 release notes

[GHC]

#9937: add updated prefetch API  mention to the 7.10 release notes
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        Reporter:  carter            |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.1
       Component:  Compiler          |                 Version:  7.9
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Changes (by carter):

 * failure:  None/Unknown => Documentation bug


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9937#comment:1>
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