Removed the incorrect promise of coherency in the answer to a query to
an informer's local cache. Removed the definition of "collection
state", because it was only used in the now-removed promise. Added a
remark about ordering of states that appear in an informer's local
cache.
Brushed up the commentary on resync period. Changed the relevant
parameter of NewSharedInformer to have the same name as the
corresponding parameter to NewSharedIndexInformer.
Kubernetes-commit: b8e2ad5926c3a6872422ad25cf9867e10e052a7d