[GHC] #12365: Update documentation for partial type signatures

[GHC]

#12365: Update documentation for partial type signatures
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        Reporter:  goldfire          |                Owner:  thomasw
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Documentation     |              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):  Phab:D2413
       Wiki Page:                    |
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Comment (by Ben Gamari <ben@…>):

 In [changeset:"e59121a5555a95911849605606f2076eba70c004/ghc" e59121a/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="e59121a5555a95911849605606f2076eba70c004"
 Update docs for partial type signatures (#12365)

 * Update the sample error messages. The messages have been reworded and
   reformatted since GHC 7.10.

 * Mention `TypeApplications` in "Where can they occur?"

 * The name of a named wild card is no longer used in the name of a
   resulting type variable. Before: `_foo` => `w_foo`, now: `_foo` => `t`
   or `a`.

 Test Plan: generate the users guide

 Reviewers: goldfire, austin, bgamari

 Reviewed By: bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2413

 GHC Trac Issues: #12365

 (cherry picked from commit 627c767b8e5587de52086d8891d7f7aabf6fa49f)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12365#comment:6>
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