Note on chopper status recorded in NeXus files

[SimonHeybrock]

This may be relevant when performing frame-unwrapping or other chopper-related processing using ScippNeutron:

If the chopper is out of phase from the setpoint, then the device will send an alarm to the EPICS IOC, which in turn will report to NICOS, to inform the user that something is not working as expected
[10:40 AM] Nicklas Holmberg
The exact limits of "how much out of phase is tolerated" before an alarm is set, you will have to ask
@markusolsson
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