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.

> To send your public key to your edX program manager, click the key and then click Export. A dialog box opens.

Note: This action only sends your public key to edX. Never share your private key with edX or any third party.