Add missing fields in Equatable implementation

The `Equatable` implementation of `LinkDestinationSummary` was missing some of the new fields which were added recently.

This commit adds them.

Author: anferbui

Sources/SwiftDocC/LinkTargets/LinkDestinationSummary.swift

@@ -112,7 +112,8 @@ public struct LinkDestinationSummary: Codable, Equatable {
     //  so that external documentation sources don't need to provide that data.
     //  Adding new required properties is considered breaking change since existing external documentation sources
     //  wouldn't necessarily meet these new requirements.
-    
+    //  Make sure to update the encoding, decoding and Equatable implementations when adding new properties.
+
     /// A collection of identifiers that all relate to some common task, as described by the title.
     public struct TaskGroup: Codable, Equatable {
         /// The title of this task group
@@ -935,12 +936,15 @@ extension LinkDestinationSummary {
         guard lhs.kind == rhs.kind else { return false }
         guard lhs.language == rhs.language else { return false }
         guard lhs.relativePresentationURL == rhs.relativePresentationURL else { return false }
+        guard lhs.absolutePresentationURL == rhs.absolutePresentationURL else { return false }
         guard lhs.title == rhs.title else { return false }
         guard lhs.abstract == rhs.abstract else { return false }
         guard lhs.availableLanguages == rhs.availableLanguages else { return false }
         guard lhs.platforms == rhs.platforms else { return false }
         guard lhs.taskGroups == rhs.taskGroups else { return false }
+        guard lhs.plainTextDeclaration == rhs.plainTextDeclaration else { return false }
         guard lhs.subheadingDeclarationFragments == rhs.subheadingDeclarationFragments else { return false }
+        guard lhs.navigatorDeclarationFragments == rhs.navigatorDeclarationFragments else { return false }
         guard lhs.redirects == rhs.redirects else { return false }
         guard lhs.topicImages == rhs.topicImages else { return false }
         guard lhs.variants == rhs.variants else { return false }