mdocml: Sync to OpenBSD: More precise description of .Xo, and don't talk

mdocml: Sync to OpenBSD: More precise description of .Xo, and don't talk

[schwarze]

Log Message:
-----------
Sync to OpenBSD: More precise description of .Xo, and don't talk
about deprecation, because there are cases were choosing .Xo or
backslash line continuation is merely a matter of taste, not a
difference in readability, and well-used .Xo is even slightly
more portable.
OK jmc@

Modified Files:
--------------
    mdocml:
        mdoc.7

Revision Data
-------------
Index: mdoc.7
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/mdoc.7,v
retrieving revision 1.169
retrieving revision 1.170
diff -Lmdoc.7 -Lmdoc.7 -u -p -r1.169 -r1.170
--- mdoc.7
+++ mdoc.7
@@ -2665,9 +2665,13 @@ and
 Close a scope opened by
 .Sx \&Xo .
 .Ss \&Xo
-Open an extension scope.
-This macro originally existed to extend the 9-argument limit of troff;
-since this limit has been lifted, the macro has been deprecated.
+Extend the header of an
+.Sx \&It
+macro or the body of a partial-implicit block macro
+beyond the end of the input line.
+This macro originally existed to work around the 9-argument limit
+of historic
+.Xr roff 7 .
 .Ss \&Xr
 Link to another manual
 .Pq Qq cross-reference .
--
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