LC ISSUE from WSA: Clarify applicability of wsdx:Interface and wsdx:Binding

Section 3.3 contains statements about "schema components that use the
xs:anyURI simple type".  Specifically mentioning this, and not
mentioning any other type, raises some doubt as to whether these
attributes may be used to annotate other types, particularly
EndpointReferences of type wsa:EndpointReferenceType.  It would be
clearer either to drop the reference to xs:anyURI specifically (leaving
"schema components"), or to soften it to something more like "schema
components, for example those that use the xs:anyURI simple type."