[groff] 20/30: groff_man*(7): Add historical item.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit fc9199fa69f0ae3a26baa92428a7f050d159a2bf
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Wed Jun 15 01:42:45 2022 -0500

    groff_man*(7): Add historical item.
    
    * Document temporal origin of .SY/.YS, .TQ, .MT/.ME, and .UR/.UE.
    * Annotate .SY and .YS as paired more consistently.
---
 tmac/groff_man.7.man.in | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/tmac/groff_man.7.man.in b/tmac/groff_man.7.man.in
index ea95ec96..db5638db 100644
--- a/tmac/groff_man.7.man.in
+++ b/tmac/groff_man.7.man.in
@@ -3076,6 +3076,15 @@ SunOS\~4.0 (1988) may have been the first to support
 .\" time and did not support the macro.  SunOS 4.0.3 (May 1989)
 .\" contained over 2,100 uses of .SB.
 .
+.I groff
+1.20 (2009) originated
+.BR .SY / .YS ,
+.BR .TQ ,
+.BR .MT / .ME ,
+and
+.BR .UR / .UE .
+.\" ...along with implementations of OP, EX, and EE.
+.
 The plan9port project's
 .I troff \" plan9port
 introduced
@@ -3435,8 +3444,7 @@ reloads each macro package as necessary.
 .TP
 .I @MACRODIR@/\:\%an\-ext\:.tmac
 Definitions of macros described above as extensions
-.RB ( .SY ,
-.BR .YS ,
+.RB ( .SY / .YS ,
 .BR .TQ ,
 .BR .EX / .EE ,
 .BR .UR / .UE ,