Add docs on let_it_be_with_refind for licensed Features

What does this MR do?

Adds docs to show usage of let_it_be_with_refind when paired with licensed features.

As noted in #10385 (comment 406499554), let_it_be_with_refind can be needed when switching off & on a licensed feature and sharing objects between the related specs.

Related issues

#10385 (comment 406499554)

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1. Review by assigned maintainer, who can always request/require the above reviews. Maintainer's review can occur before or after a technical writer review.
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