[GHC] #15722: Add -Wstar-is-type to the User's Guide

[GHC]

#15722: Add -Wstar-is-type to the User's Guide
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        Reporter:  int-index         |                Owner:  (none)
            Type:  task              |               Status:  merge
        Priority:  normal            |            Milestone:  8.6.2
       Component:  Documentation     |              Version:  8.6.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D5203
       Wiki Page:                    |
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Changes (by int-index):

 * status:  new => merge


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15722#comment:1>
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