SwiftDocCLinkDestinationSummaryLinkDestinationSummary.VariantdeclarationFragmentsInstance PropertydeclarationFragmentsvar declarationFragments: Optional<LinkDestinationSummary.DeclarationFragments?> { get }DeprecatedUse 'subheadingDeclarationFragments' instead. This deprecated API will be removed after 6.4 is released.