Improve documentation relating to use of uid in versioning and LOCATABLE descendants.

if you added the note on EHR_ACCESS and EHR_STATUS, then it will be nice if you will add it to also all other version-able object - thus also to FOLDER, ACTOR, ROLE, etc

I did this for PARTY (parent of ACTOR, ROLE), for FOLDER, the guidance is conditional on it being a top-level object.