[GHC] #12140: Clarify Trac menus for new reporters

[GHC]

#12140: Clarify Trac menus for new reporters
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        Reporter:  goldfire          |                Owner:  hvr
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Trac & Git        |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 I mentioned this to Herbert and he said that while it isn't necessarily
 possible to remove fields from the default "new ticket" page, it should be
 possible to add some in the page template to inform submitters that they
 are under no obligation to fill in all of the fields.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12140#comment:2>
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