report trailing delimiters after macros where they are usually a mistake;

the idea came up in a discussion with Thomas Klausner <wiz at NetBSD>

1 files changed, 8 insertions, 4 deletions

diff --git a/mandoc.1 b/mandoc.1
index ef280ab7..436b06f7 100644
--- a/mandoc.1
+++ b/mandoc.1
@@ -905,11 +905,15 @@ list contains two consecutive
 entries describing the same
 .Ic \&Er
 number.
-.It Sy "description line ends with a full stop"
+.It Sy "trailing delimiter"
 .Pq mdoc
-Do not use punctuation at the end of an
-.Ic \&Nd
-block.
+The last argument of an
+.Ic \&Ex , \&Fo , \&Nd , \&Nm , \&Os , \&Sh , \&Ss , \&St ,
+or
+.Ic \&Sx
+macro ends with a trailing delimiter.
+This is usually bad style and often indicates typos.
+Most likely, the delimiter can be removed.
 .It Sy "no blank before trailing delimiter"
 .Pq mdoc
 The last argument of a macro that supports trailing delimiter