Function offXRSessionEnd

offXRSessionEnd(fn: (evt: XRSessionEventArgs) => void): void
Remove a listener for when an XR session ends
Parameters
- fn: (evt: XRSessionEventArgs) => void
  The function to remove from the listeners
Returns void
Example
```
const myFunction = (evt) => {
 console.log("XR session ended", evt);
};
onXRSessionEnd(myFunction);
offXRSessionEnd(myFunction);
```