[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've added a bit of text at the top of the new ticket page,
 > Thanks for your ticket! Don't worry if you can't fill in all of the
 fields, just tell us what you know.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12140#comment:4>
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