Update prdoc for 2226 (#4401)
Mention that offenders are no longer chilled and suggest node operators
and nominators to monitor their nodes/nominees closely.
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Co-authored-by: 
Maciej <[email protected]>
Mention that offenders are no longer chilled and suggest node operators
and nominators to monitor their nodes/nominees closely.
---------
Co-authored-by: Maciej <[email protected]>