Update Node.xml: specify that normal processing happens in tree order

doc/classes/Node.xml

@@ -73,6 +73,7 @@
 			<description>
 				Called during the physics processing step of the main loop. Physics processing means that the frame rate is synced to the physics, i.e. the [param delta] variable should be constant. [param delta] is in seconds.
 				It is only called if physics processing is enabled, which is done automatically if this method is overridden, and can be toggled with [method set_physics_process].
+				Processing happens in order of [member process_physics_priority], lower priority values are called first. Nodes with the same priority are processed in tree order, or top to bottom as seen in the editor (also known as pre-order traversal).
 				Corresponds to the [constant NOTIFICATION_PHYSICS_PROCESS] notification in [method Object._notification].
 				[b]Note:[/b] This method is only called if the node is present in the scene tree (i.e. if it's not an orphan).
 			</description>
@@ -83,6 +84,7 @@
 			<description>
 				Called during the processing step of the main loop. Processing happens at every frame and as fast as possible, so the [param delta] time since the previous frame is not constant. [param delta] is in seconds.
 				It is only called if processing is enabled, which is done automatically if this method is overridden, and can be toggled with [method set_process].
+				Processing happens in order of [member process_priority], lower priority values are called first. Nodes with the same priority are processed in tree order, or top to bottom as seen in the editor (also known as pre-order traversal).
 				Corresponds to the [constant NOTIFICATION_PROCESS] notification in [method Object._notification].
 				[b]Note:[/b] This method is only called if the node is present in the scene tree (i.e. if it's not an orphan).
 			</description>
@@ -1015,10 +1017,10 @@
 			The node's processing behavior (see [enum ProcessMode]). To check if the node can process in its current mode, use [method can_process].
 		</member>
 		<member name="process_physics_priority" type="int" setter="set_physics_process_priority" getter="get_physics_process_priority" default="0">
-			Similar to [member process_priority] but for [constant NOTIFICATION_PHYSICS_PROCESS], [method _physics_process] or the internal version.
+			Similar to [member process_priority] but for [constant NOTIFICATION_PHYSICS_PROCESS], [method _physics_process], or [constant NOTIFICATION_INTERNAL_PHYSICS_PROCESS].
 		</member>
 		<member name="process_priority" type="int" setter="set_process_priority" getter="get_process_priority" default="0">
-			The node's execution order of the process callbacks ([method _process], [method _physics_process], and internal processing). Nodes whose priority value is [i]lower[/i] call their process callbacks first, regardless of tree order.
+			The node's execution order of the process callbacks ([method _process], [constant NOTIFICATION_PROCESS], and [constant NOTIFICATION_INTERNAL_PROCESS]). Nodes whose priority value is [i]lower[/i] call their process callbacks first, regardless of tree order.
 		</member>
 		<member name="process_thread_group" type="int" setter="set_process_thread_group" getter="get_process_thread_group" enum="Node.ProcessThreadGroup" default="0">
 			Set the process thread group for this node (basically, whether it receives [constant NOTIFICATION_PROCESS], [constant NOTIFICATION_PHYSICS_PROCESS], [method _process] or [method _physics_process] (and the internal versions) on the main thread or in a sub-thread.