[cvsnt] update -f option documentation (TortoiseCVS too)

[Gerhard]

Hello,

In the CVSNT manual it says about the update -f option:

"If no matching revision is found, retrieve the most recent revision
(instead of ignoring the file)."

In the TCVS Update Special dialog, there is a checkbox with a label
that sounds similar.

However, I think both are wrong. When I use this option, it seems that
if no matching revision is found, it retrieves the current revision on
HEAD -- even though there may be a more recent revision on a branch.

Is this correct?

Gerhard