[GHC] #7501: Some GHCi options are undocumented

[GHC]

#7501: Some GHCi options are undocumented
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        Reporter:  monoidal          |            Owner:  bgamari
            Type:  bug               |           Status:  patch
        Priority:  high              |        Milestone:  7.8.1
       Component:  Documentation     |          Version:  7.6.1
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by Krzysztof Gogolewski <krz.gogolewski@…>):

 In [changeset:efb9e8290f1295be7d2b9946ebd8ea6f7af09efe/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="efb9e8290f1295be7d2b9946ebd8ea6f7af09efe"
 Document remaining GHCi commands in users_guide (#7501)

 Also a small formatting change in GHCi :help
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7501#comment:9>
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