Update fp-000-summary.md update P7 summary (#2884)

* Update fp-000-summary.md update P7 summary

The relations principle had been updated previously after discussion in Ops, but that change did not propagate to the summary page.

* Update fp-000-summary.md update P7, P8

These each had changes not reflected in the summary.

Author: nataled

principles/fp-000-summary.md

@@ -24,9 +24,9 @@ P5) <b>Scope</b> - The scope of an ontology is the extent of the domain or subje
 
 P6) <b>Textual Definitions</b> - The ontology MUST have textual definitions for the majority of its classes and for top level terms in particular.
 
-P7) <b>Relations</b> - Relations SHOULD be reused from the Relations Ontology (RO).
+P7) <b>Relations</b> - Existing relations MUST be reused. New relations SHOULD be submitted to the Relations Ontology (RO).
 
-P8) <b>Documentation</b> - The owners of the ontology SHOULD strive to provide as much documentation as possible.
+P8) <b>Documentation</b> - The owners of the ontology SHOULD strive to provide as much documentation as possible. The documentation SHOULD detail the different processes specific to an ontology life cycle and target various audiences (users or developers).
 
 P9) <b>Documented Plurality of Users</b> - The ontology developers SHOULD document that the ontology is used by multiple independent people or organizations.