update movementY to ref screen* values

files/en-us/web/api/mouseevent/movementy/index.md

@@ -11,7 +11,7 @@ browser-compat: api.MouseEvent.movementY
 The **`movementY`** read-only property of the {{domxref("MouseEvent")}} interface provides the difference in the Y coordinate of the mouse pointer between the given event and the previous {{domxref("Element/mousemove_event", "mousemove")}} event.
 In other words, the value of the property is computed like this: `currentEvent.movementY = currentEvent.screenY - previousEvent.screenY`.
 
-> **Warning:** Browsers [use different units for `movementY` and {{domxref("MouseEvent.screenY", "screenY")}}](https://github.com/w3c/pointerlock/issues/42) than what the specification defines. Depending on the browser and operating system, the `movementY` units may be a physical pixel, a logical pixel, or a CSS pixel. You may want to avoid the movement properties, and instead calculate the delta between the current client values ({{domxref("MouseEvent.clientX", "clientX")}}, {{domxref("MouseEvent.clientY", "clientY")}}) and the previous client values.
+> **Warning:** Browsers [use different units for `movementY` and {{domxref("MouseEvent.screenY", "screenY")}}](https://github.com/w3c/pointerlock/issues/42) than what the specification defines. Depending on the browser and operating system, the `movementY` units may be a physical pixel, a logical pixel, or a CSS pixel. You may want to avoid the movement properties, and instead calculate the delta between the current client values ({{domxref("MouseEvent.screenX", "screenX")}}, {{domxref("MouseEvent.screenY", "screenY")}}) and the previous client values.
 
 ## Value