doc: Clarify description of `SceneTree.create_timer()`

Added the 'emit' and the 'signal' word to the 'create_timer()' method description, regarding timer behavior.

doc/classes/SceneTree.xml

@@ -61,7 +61,7 @@
 			<param index="2" name="process_in_physics" type="bool" default="false" />
 			<param index="3" name="ignore_time_scale" type="bool" default="false" />
 			<description>
-				Returns a [SceneTreeTimer] which will [signal SceneTreeTimer.timeout] after the given time in seconds elapsed in this [SceneTree].
+				Returns a [SceneTreeTimer] which will emit [signal SceneTreeTimer.timeout] after the given time in seconds elapsed in this [SceneTree].
 				If [param process_always] is set to [code]false[/code], pausing the [SceneTree] will also pause the timer.
 				If [param process_in_physics] is set to [code]true[/code], will update the [SceneTreeTimer] during the physics frame instead of the process frame (fixed framerate processing).
 				If [param ignore_time_scale] is set to [code]true[/code], will ignore [member Engine.time_scale] and update the [SceneTreeTimer] with the actual frame delta.