[tex-k] tangle.web: '.' -> `.'

[Karl Berry]

    tangle.web, line 640 (section 31, the first Pascal comment):
        procedure error; {prints '\..' and location of error message}
    should be
        procedure error; {prints `\..' and location of error message}

Yep, thanks. Maybe I even got the pipermail link right this time.

    (Interestingly, the same typo has been fixed in weave.web.)

Not the easiest thing to search for, but I didn't find any other
occurrences except in non-Knuth dvicopy.web.

    To karl: you might also want to change newbug.html, line 200
        <a href="/pipermail/tex-k/2021-May/03560.html"
    to
        <a href="/pipermail/tex-k/2021-May/003560.html"

Yep, thanks. -k