[Groff] Info file on groff should make it clear that .ad accepts a numerical argument

[James J. Ramsey]

On the info page describing groff, it's clear that .ad
accepts the arguments l,r, c, b, and n, but it is not
clear how the \n(.j register can actually be used, or
that .ad accepts certain integers (0, 1, 3, and 5, I
believe) as arguments. In particular, it's not clear
from the info documentation that the following pair of
macro definitions will work:

.de RightAdj
.nr OldDotJ \\n(.j
.ad r
..
.\"
.de EndRightAdj
.br
.ad \\n[OldDotJ]
.rr OldDotJ
..

In the ye olde NROFF/TROFF User's Manual, it says that
a value saved from \n(.j will work as an argument to
.ad. It would be nice if the Groff info said likewise.


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