Switch / update configuration description

Problem/Motivation

The Customer ID / Primary Key are switched around compared to the Microsoft page, it's rather unintuitive. I have attached screenshots, it's a little absurd and switching them both makes it more obvious which key goes where. Maybe we should also link to the https://datamarket.azure.com/account page where the information is ready to be copy pasted if you are logged into azure.

Proposed resolution

Switch the fields, maybe add a link to the account page where the key/ID can be found easily.

Remaining tasks

Discuss and do.

User interface changes

Switching two fields, making it equivalent with the Microsoft page.

API changes

None