Fix header

doc/man/man5/slapo-ppolicy.5

 .\" $OpenLDAP$
 .\" Copyright 2004 The OpenLDAP Foundation All Rights Reserved.
 .\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
-.TH SLAPD_PPOLICY 5 "RELEASEDATE" "OpenLDAP LDVERSION"
+.TH SLAPO_PPOLICY 5 "RELEASEDATE" "OpenLDAP LDVERSION"
 .SH NAME
 slapo-ppolicy \- Password Policy overlay
 .SH SYNOPSIS