ITS#9725 Update lastbind manpage to document core functionality

contrib/slapd-modules/lastbind/slapo-lastbind.5

@@ -19,6 +19,11 @@ older than a given value, thus avoiding large numbers of write
 operations penalizing performance.
 One sample use for this overlay would be to detect unused accounts.
 
+Now that OpenLDAP has native support for most of this functionality,
+storing the value in pwdLastSuccess to better interact with the Behera
+Password Policy draft 10. Unless you require lastbind_forward_updates,
+you should consider using that instead.
+
 .SH CONFIGURATION
 The config directives that are specific to the
 .B lastbind
@@ -98,6 +103,11 @@ default slapd configuration file
 .SH SEE ALSO
 .BR slapd.conf (5),
 .BR slapd (8).
+.LP
+IETF LDAP password policy proposal by P. Behera, L.  Poitou and J.
+Sermersheim:  documented in IETF document
+"draft-behera-ldap-password-policy-10.txt".
+
 The
 .BR slapo-lastbind (5)
 overlay supports dynamic configuration via