[GHC] #8190: mention --show-options in --help

[GHC]

#8190: mention --show-options in --help
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        Reporter:  carter            |            Owner:  thoughtpolice
            Type:  feature request   |           Status:  new
        Priority:  highest           |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #7843
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Comment (by Austin Seipp <aseipp@…>):

 In [changeset:32ade417f7e82b6fbcb6f1c93871ba3141a8f5c8/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="32ade417f7e82b6fbcb6f1c93871ba3141a8f5c8"
 Add --show-options to --help (#8190)

 Signed-off-by: Austin Seipp <aseipp at pobox.com>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8190#comment:9>
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