Fix bug in .D1 macro.

D1 (dee-one) has two bogus-looking lines that are not in Dl (dee-ell); and
what they do is delete the first parameter unless it is a callable macro.
This may have something to do with the reason why dee-ell is used 418 times
in /usr/share/man vs only 6 times for the crippled dee-one.

share/tmac/doc

@@ -1,4 +1,4 @@
-.\"	$NetBSD: doc,v 1.6 1998/02/15 00:40:10 thorpej Exp $
+.\"	$NetBSD: doc,v 1.7 1998/12/26 09:40:45 ross Exp $
 .\"
 .\" Copyright (c) 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -2428,9 +2428,7 @@
 .               ds A9 \\$9
 .		nr fV \\n(.$
 .		fV
-.		nr aP \\n(aP+1
-.		ie \\n(C\\n(aP==1 .\\*(A\\n(aP
-.		el .No
+.		No
 .	\}
 .\}
 .el \{\