mandoc: Document .St -isoC-2023 .

mandoc: Document .St -isoC-2023 .

[schwarze]

Log Message:
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Document .St -isoC-2023 .

While here, change the wording from "major version" to "edition"
because that's how the C standards call themselves and because
not every edition is a major version in the normal sense of the
word.

In particular, it is not an oversight that there is no macro argument
for edition 4 = C17 precisely because that is *not* a major version
but merely a minor bugfix update of C11 not adding any new features.

OK jmc@

Modified Files:
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    mandoc:
        mdoc.7

Revision Data
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Index: mdoc.7
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mdoc.7,v
diff -Lmdoc.7 -Lmdoc.7 -u -p -r1.294 -r1.295
--- mdoc.7
+++ mdoc.7
@@ -2398,12 +2398,17 @@ The original C standard.
 .It \-isoC-99
 .St -isoC-99
 .br
-The second major version of the C language standard.
+Edition 2 of the C language standard.
 .Pp
 .It \-isoC-2011
 .St -isoC-2011
 .br
-The third major version of the C language standard.
+Edition 3 of the C language standard.
+.Pp
+.It \-isoC-2023
+.St -isoC-2023
+.br
+Edition 5 of the C language standard.
 .El
 .It POSIX.1 before XPG4.2
 .Pp
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