document daily(8) log rotation;

based on a report filed in netbsd pr #37467, from Ben Wong;

usr.sbin/accton/accton.8

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: accton.8,v 1.9 2007/05/31 19:20:21 jmc Exp $
+.\"	$OpenBSD: accton.8,v 1.10 2007/12/03 18:08:39 jmc Exp $
 .\"
 .\" Copyright (c) 1993 Christopher G. Demetriou
 .\" All rights reserved.
@@ -26,7 +26,7 @@
 .\" IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: May 31 2007 $
+.Dd $Mdocdate: December 3 2007 $
 .Dt ACCTON 8
 .Os
 .Sh NAME
@@ -55,6 +55,12 @@ See
 and
 .Xr rc.conf 8
 for more information on the boot process and enabling daemons.
+.Pp
+Log rotation of the default accounting file,
+.Pa /var/account/acct ,
+is performed by the
+.Xr daily 8
+maintenance script.
 .Sh FILES
 .Bl -tag -width /var/account/acct
 .It Pa /var/account/acct
@@ -64,6 +70,7 @@ default accounting file
 .Xr lastcomm 1 ,
 .Xr acct 2 ,
 .Xr acct 5 ,
+.Xr daily 8 ,
 .Xr sa 8
 .Sh HISTORY
 The