[bug #61374] [nroff]: add option '-Z' (and any missing valid "groff" option)

[Dave]

Follow-up Comment #1, bug #61374 (project groff):

This bug report appears to be based on a misunderstanding of the purpose of
the cited commit.

Before November 2020, nroff did not recognize -z or -Z.

Commit 2219bd22
<http://git.savannah.gnu.org/cgit/groff.git/commit/?id=2219bd22> (Nov 2020)
changed this, making nroff recognize -z.  This commit amended the nroff man
page accordingly, adding "z" to the Synopsis section but erroneously calling
it "-Z" in the Description section.

The commit you cite, 5f15d0ca
<http://git.savannah.gnu.org/cgit/groff.git/commit/?id=5f15d0ca> (Jul 2021),
fixes this typo in the Description section.

nroff did not previously, and still does not, accept -Z.  This option causes
nroff to emit "usage error: invalid option '-Z'" on stderr and exit with a
status of 2 (or 1 in the 1.22.4 release).  No nroff options have been removed
by either of these commits.

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