The section at https://ea.forgerock.com/docs/ds/rest-guide/#rest2ldap-password-policies describes how to configure Rest2ldap to manage Internet-Draft password policies over REST.
Once the newer subentry password policies can be managed over REST, this section should be rewritten.
It should perhaps already be rewritten, though, to demonstrate using the admin API instead?
Not sure how to express the dependency that this issue depends on other JIRAs not finishing in a particular release, so I'm marking it a blocker. We can close it quickly if it becomes obsolete, or turns out that nothing needs to be done.