[GHC] #8432: clarify throwTo documentation

[GHC]

#8432: clarify throwTo documentation
-------------------------------------+-------------------------------------
        Reporter:  int-e             |            Owner:
            Type:  bug               |           Status:  patch
        Priority:  normal            |        Milestone:  7.8.1
       Component:  libraries/base    |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  Documentation     |       Difficulty:  Easy (less than 1
  bug                                |  hour)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
-------------------------------------+-------------------------------------

Comment (by Austin Seipp <aseipp@?>):

 In [changeset:"3782a25f36a21b2dbee62dcb0029eb2302abf2f7/base"]:
 {{{
 #!CommitTicketReference repository="base"
 revision="3782a25f36a21b2dbee62dcb0029eb2302abf2f7"
 Clarify docs for throwTo wrt atomicity (#8432)

 Authored-by: Bertram Felgenhauer <bertram.felgenhauer at gmail.com>
 Signed-off-by: Austin Seipp <aseipp at pobox.com>
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8432#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler