Function offXRSessionStart

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

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