Removing the incorrect Note on negative caching in trafficserver.
Tested on 5.0.1 and here's how ATS behaves:
ATS caches the negative response (e.g 404) when there's a valid CC header allowing to cache the response (e.g max-age=1234),
regardless of negative_response caching setting.
ATS does NOT cache the negative response (e.g. 404) when there's a CC header prohibiting to cache (e.g. private, no-store),
regardless of negative_response caching setting