Update Documentation for Changing the Account Owner

What does this MR do?

This MR changes the Change your personal details section in the docs in order to reduce the number of support tickets requested for changing ownership of the Customers Portal account.

It is fairly common for account ownership to be transferred as a result of turnover. This section is not explicit enough to guide customers through changing account ownership of the license by changing personal details. The Licensing and Renewal support teams regularly receive tickets requesting that the account owner be changed. This MR adds explicit steps on how to change owners.

The Community Programs team is launching self-checkout renewal functionality in Customer.dot. Over 3k licenses will be renewed through self-checkout and this MR will direct program members to change ownership self-service preemptively rather than filing a support ticket.

Related issues

Author's checklist

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Reviewer's checklist

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