[GHC] #15773: User Guide contains erroneous information about `-rtsopts` modes.

[GHC]

#15773: User Guide contains erroneous information about `-rtsopts` modes.
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        Reporter:  _recursion        |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Documentation     |              Version:
      Resolution:                    |             Keywords:  User Guide
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by _recursion):

 Probably something as simple as 'This is the default setting when
 `-rtsopts` is not specified at all.'

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15773#comment:4>
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