[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
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |        Blocked By:
             Test Case:              |   Related Tickets:
              Blocking:              |
Differential Revisions:              |
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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9937>
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