polish comments, no functional change:

1) advertise *.local and next_part near the top of the three scripts
2) daily: mention smtpd(8) mailq behaviour (like for sendmail, postfix, exim)
3) weekly: drop a comment trivially rehashing the next two lines of code
documenting next_part in the scripts was suggested by jmc@
ok sthen@ okan@ halex@; "i won't object" ajacoutot@

src/etc/daily

@@ -1,7 +1,10 @@
 #
-#	$OpenBSD: daily,v 1.64 2009/05/24 21:58:06 schwarze Exp $
+#	$OpenBSD: daily,v 1.65 2009/05/25 21:31:24 schwarze Exp $
 #	From: @(#)daily	8.2 (Berkeley) 1/25/94
 #
+# For local additions, create the file /etc/daily.local.
+# To get section headers, use the function next_part in daily.local.
+#
 umask 022
 
 PARTOUT=/var/log/daily.part
@@ -139,7 +142,7 @@ if [ "X$VERBOSESTATUS" != X0 ]; then
 fi
 
 # The first two regular expressions handle sendmail, the third postfix.
-# When the queue is empty, exim -bp keeps silent.
+# When the queue is empty, smtpd(8) and exim -bp keep silent.
 next_part "mail:"
 mailq | grep -v -e "^/var/spool/mqueue is empty$" \
 		-e "^[[:blank:]]*Total requests: 0$" \

src/etc/monthly

@@ -1,5 +1,8 @@
 #
-#	$OpenBSD: monthly,v 1.11 2009/05/10 19:27:25 schwarze Exp $
+#	$OpenBSD: monthly,v 1.12 2009/05/25 21:31:24 schwarze Exp $
+#
+# For local additions, create the file /etc/monthly.local.
+# To get section headers, use the function next_part in monthly.local.
 #
 umask 022
 

src/etc/weekly

@@ -1,5 +1,8 @@
 #
-#	$OpenBSD: weekly,v 1.22 2009/05/18 19:57:56 schwarze Exp $
+#	$OpenBSD: weekly,v 1.23 2009/05/25 21:31:24 schwarze Exp $
+#
+# For local additions, create the file /etc/weekly.local.
+# To get section headers, use the function next_part in weekly.local.
 #
 umask 022
 
@@ -63,8 +66,6 @@ fi
 next_part "Rebuilding whatis databases:"
 /usr/libexec/makewhatis
 
-# If LOGINACCOUNTING is set to 1 in the environment, report user
-# accounting information
 next_part "Doing login accounting:"
 [ "X$LOGINACCOUNTING" = X1 ] && {
 	ac -p | sort -nr -k 2