Remove reference to 3D shapes in RigidBody2D.xml contacts description.

(cherry picked from commit e7edbcedc93c61b38c6d603e2652076b9dc0552a)

doc/classes/RigidBody2D.xml

@@ -140,7 +140,7 @@
 		</member>
 		<member name="contacts_reported" type="int" setter="set_max_contacts_reported" getter="get_max_contacts_reported" default="0">
 			The maximum number of contacts that will be recorded. Requires [member contact_monitor] to be set to [code]true[/code].
-			[b]Note:[/b] The number of contacts is different from the number of collisions. Collisions between parallel edges will result in two contacts (one at each end), and collisions between parallel faces will result in four contacts (one at each corner).
+			[b]Note:[/b] The number of contacts is different from the number of collisions. Collisions between parallel edges will result in two contacts (one at each end).
 		</member>
 		<member name="continuous_cd" type="int" setter="set_continuous_collision_detection_mode" getter="get_continuous_collision_detection_mode" enum="RigidBody2D.CCDMode" default="0">
 			Continuous collision detection mode.