NPA-6879: Add RPN as Related API in OAS Spec

[davesmallnhs]

Pull Request

🧾 Ticket Link

https://nhsd-jira.digital.nhs.uk/browse/NPA-6879

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📄 Description/Summary of Changes

• Single line text addition

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🧪 Developer Testing Carried Out

• None

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Please ensure the following naming conventions are followed:

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[github-actions]

This branch is work on a ticket in the NHS Digital NPA JIRA Project. Here's a handy link to the ticket:

NPA-6879

[Copilot]

Pull request overview

This PR updates the OpenAPI specification description to include the Related Person Network (RPN) as an additional related API, alongside the existing Personal Demographics Service (PDS) reference.

Changes:

• Added a new “Related APIs” bullet linking to the Related Person Network - FHIR API in the info.description section.

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