Improve Goto and GotoIf related documentation
Correct documentation on labeliftrue and labeliffalse parameters of
GotoIf() and update several other locations that use the same syntax.
(closes issue ASTERISK-20007)
Patch-by: Leif Madsen
Reported-by: WIMPy
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Merged revisions 369869 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 369871 from http://svn.asterisk.org/svn/asterisk/branches/10
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@369872
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