Clarify session invalidation when reconnecting. #7571
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Since the only section I could find documenting session invalidation behavior was in the disconnecting section, I figured reiterating the invalidation process would be more helpful here present than absent. Myself and others spent 3 weeks trying to get a resume before we noticed this near-footnote of a section. Hopefully putting this warning/note under the reconnect payload will prevent others from wasting as much time as I did on this.