14.1.2 Applicability: clarify that "Property" means "structural property" and excludes navigation properties

Section 14.1.2 Applicability says

It should instead say "structural property" because now it seems to be a superset of structural and navigation properties, which does not make sense.

Defining a term that applies to both structural and navigation properties should be done by listing both: AppliesTo="Property NavigationProperty".

Otherwise we would lose the ability to define terms that only apply to structural properties.