[bug #60820] groff.texi: clarify meaning of | operator in vertical-movement contexts

[Dave]

Follow-up Comment #2, bug #60820 (project groff):

Branden replied in that bug, pointing out new text added to the manual in
commit 1228acc4
<http://git.savannah.gnu.org/cgit/groff.git/commit/?id=1228acc4>, which does
indeed clarify much about roff cursor positioning, including the sentence
"Therefore the initial drawing position... is not at the origin, but down and
to the right of it."

The new text doesn't state, and I don't think it's an obvious inference, that
the vertical placement of the initial drawing position is also the vertical
origin for | positioning.  It does make some intuitive sense if the next thing
drawn after a \v'|' movement is text, but if it's a drawing command, the
behavior seems more puzzling.

It's also nonintuitive, and thus worth noting, that the vertical page origin
is based on the current line spacing, which means it can move over the course
of processing a page.

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