[texdoc] viewer options ignored in .cnf?

[Karl Berry]

    (c) viewer_pdf = xpdf "%s" &

I feel like I copied the example with quotes out of the manual, but
maybe I was just assuming.

In any case, I don't see a need to write code handle "%s" in the cnf
files specially; just be sure that the examples that don't have the
quotes and point out that texdoc itself does quoting, so filenames with
spaces (for example) are handled correctly without special intervention
by the user.  Maybe I missed that when I looked at the manual.

Anyway, I changed my texdoc.cnf to not have the quotes.

Thanks,
karl