Ahodges/documentation/doc764

@WatsonEmily , please distribute for PM review for usability by our audience.
@jhelbert , @stroilova , @shnayder , @rocha  please review for accuracy, completeness, and level of detail, particularly wrt data czars who will need to revise scripts for post-download processing.
@mhoeber , @srpearce please copy edit.
"In order to connect to the **edx-course-data** bucket with a third-party tool, you may need to specify both the name of the bucket and the name of your {org} directory. For example, ``edx-course-data/universityx``."
@stroilova , is that complete or does it need the slash at the end too? will they know what their org is?