Misc editorial improvements:

1. For OWL and ShEx, clarify the normative status like this: "For purposes of validating FHIR RDF instance data -- data "on the wire" -- the logical meaning of the OWL ontology is normative. However, ..." Discussed 30-Oct-2025.

2. In the monotonicity discussion, explain that there are two known places where non-monotonicity arises in FHIR RDF: 1. in modifier extensions; and 2. where an element/property is marked is-modifier in its structure definition, e.g., fhir:status .