[GHC] #8575: remove obsolete "stolen syntax"

[GHC]

#8575: remove obsolete "stolen syntax"
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       Reporter:  aavogt            |             Owner:
           Type:  bug               |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Documentation     |           Version:  7.6.3
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 Hi. The quasiquotes ```[:x| |]``` and implicitparams ```%x``` syntax
 listed as stolen have not been stolen for a long time.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8575>
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