Update prodnotes.md

[SuitDeer]

Pull Request

What? (description)

Why? (reasoning)

Link to "Reference Architecture documentation" is not linking to the document

Acceptance

Please use the following checklist:

• you linked an issue (if applicable)
• you included tests (if applicable)
• you ran conformance (make conformance)
• you formatted your code (make fmt)
• you linted your code (make lint)
• you generated documentation (make docs)
• you ran unit-tests (make unit-tests)

See make help for a description of the available targets.

[rothgar]

Thanks! Some of our URLs have changed and we probably don't want to link to one reference architecture document over another. I think you can find all of them at https://www.siderolabs.com/resources/ which is probably the correct link

[smira]

thank you!

[smira]

/m