Semantic change to dns guide

I separated this from my textual fixes, because it represents a semantic change. Wouldn't changing the TTL value affect "downstream" DNS servers which had requested the entries from this "upstream" authoritative source? http://en.wikipedia.org/wiki/Upstream_server mentions that the upstream server provides the service to the downstream servers, although, to be fair, it mentions that the term downstream is rarely used, so maybe I'm just being weird.