Fix XPS specification link

[gewarren]

No description provided.

[learn-build-service-prod]

Learn Build status updates of commit 9bdf2de:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Windows.Documents.DocumentStructures/StoryFragment.xml	✅Succeeded	View
xml/System.Windows.Documents/LinkTarget.xml	✅Succeeded	View
xml/System.Windows.Documents/PageContent.xml	✅Succeeded	View
xml/System.Windows.Xps.Packaging/IDocumentStructureProvider.xml	✅Succeeded	View
xml/System.Windows.Xps.Packaging/IXpsFixedDocumentReader.xml	✅Succeeded	View
xml/System.Windows.Xps.Packaging/IXpsFixedDocumentSequenceReader.xml	✅Succeeded	View
xml/System.Windows.Xps.Packaging/IXpsFixedPageReader.xml	✅Succeeded	View
xml/System.Windows.Xps.Packaging/XpsResourceDictionary.xml	✅Succeeded	View
xml/System.Windows.Xps.Packaging/XpsSignatureDefinition.xml	✅Succeeded	View
xml/System.Windows.Xps.Serialization/BasePackagingPolicy.xml	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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