Control Key -> Account Id further expanation

[claireclark1]

Thanks for reporting an issue!

Where is the Issue?

https://docs.frequency.xyz/Identity/ControlKeys.html

What is wrong with it?

Uses the term "Control Key" where in most places in our code and UI we use the term "Account Id".

What should it be?

Clarify what terms are used where and why they are interchangeable in the glossary and in the identity management section.

Any other comments?

While "Control Key" is a standard in the DSNP and Frequency Docs, we often refer to the same value as "Account Id", yet we don't define their relationship in the docs.