Break the (too) big lead paragraph into three smaller ones.

lib/libc/stdio/scanf.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: scanf.3,v 1.25 2010/03/21 20:38:20 jruoho Exp $
+.\"	$NetBSD: scanf.3,v 1.26 2010/03/22 13:15:54 jruoho Exp $
 .\"
 .\" Copyright (c) 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -73,6 +73,7 @@ the results from such conversions, if any,
 are stored through the
 .Em pointer
 arguments.
+.Pp
 The
 .Fn scanf
 function
@@ -106,6 +107,7 @@ the
 and
 .Fn vsprintf
 functions respectively.
+.Pp
 Each successive
 .Em pointer
 argument must correspond properly with