x11-ssh-askpass.man.in: spell "LED" consistently

Update x11-ssh-askman manpage app-defaults paths to X11R7

Now matches actual code

Whitespace stuff; new sentence, new line; fix some xrefs; use Aq more.

Update ssh-askpass to version 1.2.0. This adds, among other changes,
teh ability to display multiples lines as the message, sth openssh
assumes and a man page.