mandoc: document -O mdoc; triggered by a question from jmc@ and OK jmc@

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
document -O mdoc; triggered by a question from jmc@ and OK jmc@

Modified Files:
--------------
    mandoc:
        mandoc.1

Revision Data
-------------
Index: mandoc.1
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mandoc.1,v
retrieving revision 1.217
retrieving revision 1.218
diff -Lmandoc.1 -Lmandoc.1 -u -p -r1.217 -r1.218
--- mandoc.1
+++ mandoc.1
@@ -315,6 +315,20 @@ and seven for
 .Xr man 7 .
 Increasing this is not recommended; it may result in degraded formatting,
 for example overfull lines or ugly line breaks.
+.It Cm mdoc
+Format
+.Xr man 7
+input files in
+.Xr mdoc 7
+output style.
+Specifically, this suppresses the two additional blank lines near the
+top and the bottom of each page, and it implies
+.Fl O Cm indent Ns =5 .
+One useful application is for checking that
+.Fl T Cm man
+output formats in the same way as the
+.Xr mdoc 7
+source it was generated from.
 .It Cm width Ns = Ns Ar width
 The output width is set to
 .Ar width .
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