[GHC] #9957: Document -fwarn-unticked-promoted-constructors in release notes

[GHC]

#9957: Document -fwarn-unticked-promoted-constructors in release notes
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        Reporter:  adamgundry        |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  normal            |               Milestone:  7.10.1
       Component:  Documentation     |                 Version:  7.10.1-rc1
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by Austin Seipp <austin@…>):

 In [changeset:"cb65bdbca83f43d72dd2fc6ecd1897e734454d33/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="cb65bdbca83f43d72dd2fc6ecd1897e734454d33"
 Doc fix (follow up to #9957)

 Signed-off-by: Austin Seipp <austin at well-typed.com>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9957#comment:2>
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