func_strings: Documentation fix for QUOTE()

Example output was inaccurate.

(issue ASTERISK-22970)
(closes issue ASTERISK-22970)
Reported by: Gareth Palmer
Patches:
   func_strings.patch uploaded by Gareth Palmer (license 5169)
........

Merged revisions 404081 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@404087 f38db490-d61c-443f-a65b-d21fe96a405b