Edited the KinematicBody and KinematicBody2D docs

Explained the reason why move_and_slide should be used in _physics_process

(cherry picked from commit b7dbf41aa5)

doc/classes/KinematicBody.xml

@@ -105,6 +105,7 @@
 			</argument>
 			<description>
 				Moves the body along a vector. If the body collides with another, it will slide along the other body rather than stop immediately. If the other body is a [KinematicBody] or [RigidBody], it will also be affected by the motion of the other body. You can use this to make moving or rotating platforms, or to make nodes push other nodes.
+				This method should be used in [method Node._physics_process] (or in a method called by [method Node._physics_process]), as it uses the physics step's [code]delta[/code] value automatically in calculations. Otherwise, the simulation will run at an incorrect speed.
 				[code]linear_velocity[/code] is the velocity vector (typically meters per second). Unlike in [method move_and_collide], you should [i]not[/i] multiply it by [code]delta[/code] — the physics engine handles applying the velocity. 
 				[code]up_direction[/code] is the up direction, used to determine what is a wall and what is a floor or a ceiling. If set to the default value of [code]Vector3(0, 0, 0)[/code], everything is considered a wall.
 				If [code]stop_on_slope[/code] is [code]true[/code], body will not slide on slopes if you include gravity in [code]linear_velocity[/code].

doc/classes/KinematicBody2D.xml

@@ -103,6 +103,7 @@
 			</argument>
 			<description>
 				Moves the body along a vector. If the body collides with another, it will slide along the other body rather than stop immediately. If the other body is a [KinematicBody2D] or [RigidBody2D], it will also be affected by the motion of the other body. You can use this to make moving or rotating platforms, or to make nodes push other nodes.
+				This method should be used in [method Node._physics_process] (or in a method called by [method Node._physics_process]), as it uses the physics step's [code]delta[/code] value automatically in calculations. Otherwise, the simulation will run at an incorrect speed.
 				[code]linear_velocity[/code] is the velocity vector in pixels per second. Unlike in [method move_and_collide], you should [i]not[/i] multiply it by [code]delta[/code] — the physics engine handles applying the velocity. 
 				[code]up_direction[/code] is the up direction, used to determine what is a wall and what is a floor or a ceiling. If set to the default value of [code]Vector2(0, 0)[/code], everything is considered a wall. This is useful for topdown games.
 				If [code]stop_on_slope[/code] is [code]true[/code], body will not slide on slopes when you include gravity in [code]linear_velocity[/code] and the body is standing still.