Ahodges/documentation/doc158

@WatsonEmily please share with PMs who have worked through this process with data czars before... I'd love to get their feedback on level of detail and completeness.
@rocha and @stroilova , please let me know if this information is accurate (or designate others in Analytics).
@mhoeber and @srpearce , your feedback always welcome.

Who does the encrypting and the sending? > After the edX Analytics team creates these access credentials for you, edX uses the public encryption key that you sent to your program manager to encrypt the credentials into a credentials.csv.gpg file. EdX then sends this file to you as an email attachment.

Or: After the edX Analytics team creates these access credentials for you, edX encrypts the credentials into a credentials.csv.gpg file using the public encryption key that you sent to your program manager. EdX then sends this file to you as an email attachment.