[poe] Issue: XML Linking marked as Editorial

riannella has just labeled an issue for https://github.com/w3c/poe as 
"Editorial":

== XML Linking ==
No that we support policy-level assets, parties, actions, we do not 
need to have XML linking (id and idref).

Update  (or remove) this section?

See https://github.com/w3c/poe/issues/90