Add restrictions to MultiplayerSynchronizer editor and documentation

modules/multiplayer/doc_classes/MultiplayerSynchronizer.xml

@@ -8,6 +8,7 @@
 		Visibility can be handled directly with [method set_visibility_for] or as-needed with [method add_visibility_filter] and [method update_visibility].
 		[MultiplayerSpawner]s will handle nodes according to visibility of synchronizers as long as the node at [member root_path] was spawned by one.
 		Internally, [MultiplayerSynchronizer] uses [method MultiplayerAPI.object_configuration_add] to notify synchronization start passing the [Node] at [member root_path] as the [code]object[/code] and itself as the [code]configuration[/code], and uses [method MultiplayerAPI.object_configuration_remove] to notify synchronization end in a similar way.
+		[b]Note:[/b] Synchronization is not supported for [Object] type properties, like [Resource]. Properties that are unique to each peer, like the instance IDs of [Object]s (see [method Object.get_instance_id]) or [RID]s, will also not work in synchronization.
 	</description>
 	<tutorials>
 	</tutorials>

modules/multiplayer/doc_classes/SceneReplicationConfig.xml

@@ -14,6 +14,7 @@
 			<param index="1" name="index" type="int" default="-1" />
 			<description>
 				Adds the property identified by the given [param path] to the list of the properties being synchronized, optionally passing an [param index].
+				[b]Note:[/b] For details on restrictions and limitations on property synchronization, see [MultiplayerSynchronizer].
 			</description>
 		</method>
 		<method name="get_properties" qualifiers="const">