Docs: Add tutorials for KinematicBody2D

(cherry picked from commit 36e9af4812cc54e61eb2171bea4d5032b11cb819)

doc/classes/KinematicBody2D.xml

@@ -9,6 +9,8 @@
 		Kinematic Characters: KinematicBody2D also has an API for moving objects (the [method move_and_collide] and [method move_and_slide] methods) while performing collision tests. This makes them really useful to implement characters that collide against a world, but that don't require advanced physics.
 	</description>
 	<tutorials>
+		<link>https://docs.godotengine.org/en/3.1/tutorials/physics/kinematic_character_2d.html</link>
+		<link>https://docs.godotengine.org/en/3.1/tutorials/physics/using_kinematic_body_2d.html</link>
 	</tutorials>
 	<methods>
 		<method name="get_floor_velocity" qualifiers="const">