Update access.md with sponsored bucket info

[scottveirs]

Once we are done switching from the old S3 buckets to the new Amazon-sponsored ones, update the access.md file in this repo.

New buckets:

• audio-orcasound-net (will now hold any raw audio format, lossy or lossless)
• audio-deriv-orcasound-net (holds all processed data that were derived from the raw audio data)

Old buckets:

• streaming-orcasound-net (HLS raw data, by production node, then epoch datetime directory)
• dev-streaming-orcasound-net (HLS raw data from development nodes; for testing only, with no expectation of long-term storage)
• archive-orcasound-net (Lossless raw data, FLAC format)
• dev-archive-orcasound-net (For testing streams of lossless audio data)
• acoustic-sandbox (catch all for labeled data and emerging models/applications)

[scottveirs]

@valentina-s -- Do you have a pointer to the diagram you fixed a while back? If so, maybe I can revise it again?

@paulcretu -- Flagging this issue for you in case you want to comment or improve.