Merged revisions 7470 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.2

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r7470 | kpfleming | 2005-12-13 12:54:22 -0600 (Tue, 13 Dec 2005) | 2 lines

clarify substring documentation

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@7471 65c4cc65-6c06-0410-ace0-fbb531ad65f3