Rectify spiderOakApp.ajax() docstring typo and clarify the text.
Notify users that mobile app logins are not ZK.

They are notified of this every time they try until the first time elect
to continue, and then they are not notified again.

The notification happens before their credentials are sent.
Use "Zero-Knowledge" per emerging convention.

Also, streamline some phrasing.
Twiddling.
Is done.
Quote 'Zero-Knowledge' to Follow style rules.