Fix rigid body property description

(cherry picked from commit 6d854816702762ac142bd5b10a015a21679ba472)

doc/classes/RigidBody2D.xml

@@ -151,7 +151,7 @@
 			See [method add_constant_torque].
 		</member>
 		<member name="contact_monitor" type="bool" setter="set_contact_monitor" getter="is_contact_monitor_enabled" default="false">
-			If [code]true[/code], the RigidBody2D will emit signals when it collides with another RigidBody2D.
+			If [code]true[/code], the RigidBody2D will emit signals when it collides with another body.
 			[b]Note:[/b] By default the maximum contacts reported is set to 0, meaning nothing will be recorded, see [member max_contacts_reported].
 		</member>
 		<member name="continuous_cd" type="int" setter="set_continuous_collision_detection_mode" getter="get_continuous_collision_detection_mode" enum="RigidBody2D.CCDMode" default="0">

doc/classes/RigidBody3D.xml

@@ -158,7 +158,7 @@
 			See [method add_constant_torque].
 		</member>
 		<member name="contact_monitor" type="bool" setter="set_contact_monitor" getter="is_contact_monitor_enabled" default="false">
-			If [code]true[/code], the RigidBody3D will emit signals when it collides with another RigidBody3D.
+			If [code]true[/code], the RigidBody3D will emit signals when it collides with another body.
 			[b]Note:[/b] By default the maximum contacts reported is set to 0, meaning nothing will be recorded, see [member max_contacts_reported].
 		</member>
 		<member name="continuous_cd" type="bool" setter="set_use_continuous_collision_detection" getter="is_using_continuous_collision_detection" default="false">