Account ownership workflow updates

Why is this change being made?

This MR removes mention of verifying a users identity via repository verification as that method is not used and is no longer mentioned in the risk factor worksheet. It also makes various minor changes to wording within the workflow.

Does this MR meet the acceptance criteria?

Assign to DRI

• Did you assign this change to the correct DRI of the page or information you are changing?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what