Clarify object metadata and state 2 GB limit once
Clarify object metadata and state 2 GB limit once

timuralp/s3proxy,bouncestorage/s3proxy,flandr/s3proxy,kahing/s3proxy,bouncestorage/s3proxy,timuralp/s3proxy,andrewgaul/s3proxy,flandr/s3proxy,kahing/s3proxy,andrewgaul/s3proxy