[bug #55789] tmac/doc-syms-u: Some abbreviations are missing.

[Ingo Schwarze]

Update of bug #55789 (project groff):

                Severity:              3 - Normal => 2 - Minor              
                  Status:                    None => Confirmed              
             Assigned to:                    None => schwarze               

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Follow-up Comment #1:

1) -xsh4.2 is unused in FreeBSD-12.0, NetBSD-8.0, OpenBSD-6.4, and in the
Linux man pages project.  It is an alias for a part of an ancient standard
that is no longer important.  I should remove it from mandoc rather than
having it added to groff.

2) -susv1 is also unused in all four systems.  But given that the original
Single UNIX Specification is of considerable historical importance, that the
alias -xpg4.2 is widely used, and that the newer versions -susv2 and -susv3
also see some limited use, adding it to groff for completeness may be better
than deleting it from mandoc.

3) -susv4 is used in a handful of pages in FreeBSD-12.0.  Using the alias
-p1003.1-2008 would probably be better, but i guess breaking those pages would
be gratuitious, and besides, -susv4 is the current version of the standard, so
i think adding the alias is OK.

If somebody confirms in a comment that adding -susv1 and -susv4 and deleting
-xsh4.2 is a reasonable plan, i'll write and push a diff doing that.  Of
course, it's an extremely low-priority issue...

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