[GHC] #7501: Some GHCi options are undocummented

[GHC]

#7501: Some GHCi options are undocummented
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        Reporter:  monoidal          |            Owner:
            Type:  bug               |           Status:  new
        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 bgamari):

 To be clear, the following commands still need documentation,

  * `:issafe`
  * `:list`
  * `:steplocal`
  * `:stepmodule`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7501#comment:6>
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