There are a lot of typos besides this one, and always have been. Personally I'd rather spend the time proofing current docs.
Also, there's been a tendency in the past to not regenerate the online docs for each point release in a stable branch (particularly for formats like PS and PDF). So that's been another reason we haven't bothered with this in the past. I tend to agree with Tom that it's not really worth the trouble to backport these kinds of fixes, as long as it's just a cosmetic typo.
-Neil
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