[GHC] #8277: Fix name of vanilla RTS way in the user's guide

[GHC]

#8277: Fix name of vanilla RTS way in the user's guide
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       Reporter:  rwbarton          |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Documentation     |           Version:  7.7
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  Documentation bug
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 A program compiled with the vanilla way, when queried with `+RTS --info`,
 actually prints
 {{{
 ...
  ,("RTS way", "rts_v")
 ...
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8277>
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