Update 2FA troubleshooting docs
What does this MR do and why?
Moved the two-factor authentication (2FA) Troubleshooting and Recovery options sections to a new page.
Reason
This should make the self-help information for 2FA issues more discoverable to customers and users.
Other considerations
From the linked issue: Consider other options, such as raising the profile of 2FA on key landing pages such as:
Related issue: #468894
Edited by Brendan Lynch