Add comment to make clear that RoomStateEvent.Events does not update related objects in the js-sdk

[toger5]

Signed-off-by: Timo K toger5@hotmail.de

Checklist

• Tests written for new code (and old code if feasible).
• New or updated public/exported symbols have accurate TSDoc documentation.
• Linter and other CI checks pass.
• Sign-off given on the changes (see CONTRIBUTING.md).

[toger5]

We use canInvite in a couple of places but changing the power levels did not trigger anything so the related buttons were still greyed out.
I was trying to use useEventEmitterState with RoomStateEvent.Events but noticed, that the objects requested by canInvite were not updated yet when the event got emitted. This comment should help mitigate this pitfall.