Merge pull request godotengine#115549 from Calinou/doc-upnp-update-example

Fix UPNP code sample using `OK` constant incorrectly

Author: Repiteo

modules/upnp/doc_classes/UPNP.xml

@@ -29,15 +29,15 @@
 			var upnp = UPNP.new()
 			var err = upnp.discover()
 
-			if err != OK:
+			if err != UPNP.UPNP_RESULT_SUCCESS:
 				push_error(str(err))
 				upnp_completed.emit(err)
 				return
 
 			if upnp.get_gateway() and upnp.get_gateway().is_valid_gateway():
 				upnp.add_port_mapping(server_port, server_port, ProjectSettings.get_setting("application/config/name"), "UDP")
 				upnp.add_port_mapping(server_port, server_port, ProjectSettings.get_setting("application/config/name"), "TCP")
-				upnp_completed.emit(OK)
+				upnp_completed.emit(UPNP.UPNP_RESULT_SUCCESS)
 
 		func _ready():
 			thread = Thread.new()