Merge request approval rule editing documentation is unclear

This documentation for preventing editing of approval rules in merge requests states:

When this field is changed, it can affect all open merge requests depending on the setting:

• If users could edit approval rules previously, and you disable this behavior, all open merge requests are updated to enforce the approval rules.
• If users could not edit approval rules previously, and you enable approval rule editing, open merge requests remain unchanged. This preserves any changes already made to approval rules in those merge requests.

What is being enforced in this statement: all open merge requests are updated to enforce the approval rules? Is this referring to the edited rules or the original unedited rules?

Is this correct: This preserves any changes already made to approval rules in those merge requests.? It states changes already made, but if editing was previously disabled how would there be changes?

We need to investigate what happens and then improve the wording here.