[groff] 02/19: [ms]: Document `AU` behavioral diff from AT&T.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit b059892a1b66b4343ba112bd96ff43e0c5f37d1f
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Tue Jul 5 23:03:21 2022 -0500

    [ms]: Document `AU` behavioral diff from AT&T.
    
    Admittedly somewhat obscure, relying on cover sheet macro usage.
---
 doc/groff.texi      | 4 ++++
 doc/ms.ms           | 9 +++++++++
 tmac/groff_ms.7.man | 9 +++++++++
 3 files changed, 22 insertions(+)

diff --git a/doc/groff.texi b/doc/groff.texi
index f264da67..0c5b3083 100644
--- a/doc/groff.texi
+++ b/doc/groff.texi
@@ -4449,6 +4449,10 @@ interprets values equal to or larger than 1000 as 
decimal fractions
 multiplied by 1000.  See the @code{PS} register in @ref{ms Document
 Control Settings}.
 
+@item
+@acronym{AT&T} @file{ms}'s @code{AU} macro recognized arguments that
+were used with some cover sheet types; @code{groff} @file{ms} does not.
+
 @item
 Right-aligned displays are available.  The @acronym{AT&T} @file{ms}
 manual observes that ``it is tempting to assume that @samp{.DS R} will
diff --git a/doc/ms.ms b/doc/ms.ms
index a5f3358f..d5ebed1d 100644
--- a/doc/ms.ms
+++ b/doc/ms.ms
@@ -3629,6 +3629,15 @@ is preferable.
 .
 .
 .PP
+AT&T
+.I ms 's
+.CW AU
+macro recognized arguments that were used with some cover sheet types;
+.I "groff ms"
+does not.
+.
+.
+.PP
 Right-aligned displays are available.
 .
 The AT&T
diff --git a/tmac/groff_ms.7.man b/tmac/groff_ms.7.man
index d1c2828a..ca087623 100644
--- a/tmac/groff_ms.7.man
+++ b/tmac/groff_ms.7.man
@@ -2425,6 +2425,15 @@ accessing an undefined register automatically defines it.
 .
 .
 .IP \[bu]
+AT&T
+.IR ms 's
+.B AU
+macro recognized arguments that were used with some cover sheet types;
+.I groff ms
+does not.
+.
+.
+.IP \[bu]
 Right-aligned displays are available.
 .
 The AT&T