Fix default port

doc/guide/admin/runningslapd.sdf

@@ -28,7 +28,7 @@ specific host-port pairs or other protocol schemes (such as
 ldaps:// or ldapi://).  For example,
 {{EX:-h "ldaps:// ldap://127.0.0.1:666"}} will create
 two listeners: one for LDAP over SSL on all interfaces on
-the default LDAP/SSL port 646, and one for LDAP over TCP on
+the default LDAP/SSL port 636, and one for LDAP over TCP on
 the {{EX:localhost}} ({{loopback}}) interface on port 666.
 Hosts may be specified using IPv4 dotted-decimal form or
 using host names.  Port values must be numeric.