Updated the "APIProtocol" and "Client" extension for the DocC documentation catalog in the library target.

Sources/DiscogsService/Catalogs/DiscogsService.docc/Extensions/Client.md

@@ -53,4 +53,11 @@
 - ``Client/deleteInstanceFromCollectionFolder(_:)``
 - ``Client/getCustomFields(_:)``
 - ``Client/editFieldsInstance(_:)``
-- ``Client/getCollectionValue(_:)``
+- ``Client/getCollectionValue(_:)``
+
+### User Wantlist
+
+- ``Client/getWantlist(_:)``
+- ``Client/addToWantlist(_:)``
+- ``Client/updateInWantlist(_:)``
+- ``Client/deleteFromWantlist(_:)``