The description at the start of the docs is actually pre-pike
behavior replaced by the first "future plans" item which was
the counting quotas effort in pike. This change re-words the
main description to talk about counting quotas at a high level,
links in more of the relevant APIs, links to the config options
correctly, drops the future plan about counting quotas (since it
is no longer the future) and fleshes out a little blurb about
hierarchical quotas by linking to the unified limits spec.
Change-Id: I559938f69c9b462a9b0baeb5d1d4d915f893273e
Matt Riedemann
47559663aa