Correct an Rdoc comment to explain the way we actually handle caching headers in FeedClient.
Correct an Rdoc comment to explain the way we actually handle caching headers in FeedClient.

jmwenda/feedbunch,amatriain/feedbunch,amatriain/feedbunch,amatriain/feedbunch,jmwenda/feedbunch,jmwenda/feedbunch,amatriain/feedbunch