End sentence with a dot. Remove trailing whitespace.

lib/libc/sys/poll.2

@@ -1,4 +1,4 @@
-.\"	$NetBSD: poll.2,v 1.22 2005/03/10 00:31:38 kleink Exp $
+.\"	$NetBSD: poll.2,v 1.23 2005/03/10 16:51:42 wiz Exp $
 .\"
 .\" Copyright (c) 1998 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -238,10 +238,10 @@ The
 .Fn poll
 function appeared in
 .At V.3 .
-The 
+The
 .Fn pollts
 function first appeared in
-.Nx 3.0
+.Nx 3.0 .
 .Sh BUGS
 The distinction between some of the fields in the
 .Fa events