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

[GHC]

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

Comment(by marlowsd@…):

 commit ddd3c5199fd40386c6385689fdf5c542f831bcf0
 {{{
 Author: Simon Marlow <marlowsd at gmail.com>
 Date:   Wed Oct 19 10:37:08 2011 +0100

     add info about pulling changes (#5562)

  README |    6 ++++++
  1 files changed, 6 insertions(+), 0 deletions(-)
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5562#comment:2>
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