Add verbiage for all attributes provided in the XSD file

[kleihan]

The Orchestra spec does not include a description of all attributes. Some are only defined in the XSD file. The following attributes should be added to the spec together with a description:

• Attribute group "entityAttribGrp": attributes "supported", "issue", "lastModified", "replaced", "replacedEP", "replacedByField", "changeType"
• Complex type "categoryType": attributes "FIXMLFileName", "componentType", "section", "includeFile"

[kleihan]

Complex type componentRefType supports attribute instanceName.

		<xs:attribute name="instanceName" type="fixr:ComponentName_t">
			<xs:annotation>
				<xs:documentation>Override the component name for this instance, for
					code generation and the like. Allows more than one instance of a
					component in a message.
				</xs:documentation>
			</xs:annotation>
		</xs:attribute>