doc: Add default values to all properties

Thanks to @bojidar-bg's impressive work in #29380.

modules/visual_script/doc_classes/VisualScriptSequence.xml

@@ -17,7 +17,7 @@
 	<methods>
 	</methods>
 	<members>
-		<member name="steps" type="int" setter="set_steps" getter="get_steps">
+		<member name="steps" type="int" setter="set_steps" getter="get_steps" default="1">
 			The number of steps in the sequence.
 		</member>
 	</members>