[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:  closed
        Priority:  highest           |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  7.7
      Resolution:  fixed             |         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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Changes (by thoughtpolice):

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


Comment:

 The man page is auto-generated and already has `--show-options`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8190#comment:10>
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