Add additional causes of required stops

What does this MR do and why?

Adds two potential causes of required stops to our required stop documentation.

This update was considered after we discovered an issue with upgrades due to a very out of date migration timestamp. #408304 (closed)

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.