[GHC] #5562: document sync-all in README

[GHC]

#5562: document sync-all in README
---------------------------+------------------------------------------------
  Reporter:  GregWeber     |          Owner:  simonmar        
      Type:  bug           |         Status:  closed          
  Priority:  high          |      Milestone:  7.4.1           
 Component:  Compiler      |        Version:  7.2.1           
Resolution:  fixed         |       Keywords:                  
  Testcase:                |      Blockedby:                  
Difficulty:                |             Os:  Unknown/Multiple
  Blocking:                |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown  |  
---------------------------+------------------------------------------------
Changes (by simonmar):

  * status:  new => closed
  * resolution:  => fixed


-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5562#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler