Issue in /src/pages/XMPNamespaces/XMPDataTypes/ResourceRef/index.md

The description of `ResourceRef` says: `Except for instanceID, the fields are all properties from the referenced resource's xmpMM namespace.` which contradicts with the description of the `instanceID` field which says: `The value of the xmpMM:InstanceID property from the referenced resource.`

The fields which do not refer to `xmpMM` in their descriptions are:
- filePath
- alternatePaths
- lastModifyDate
- partMapping

Open /src/pages/XMPNamespaces/XMPDataTypes/ResourceRef/index.md and compare the ResourceRef description with the descriptions of instanceID, filePath, alternatePaths, lastModifyDate, and partMapping. Update the contradictory wording so the overview matches those field descriptions, then review the page to confirm the descriptions are consistent.

Written by the indexing model from the issue text.