NPA-6294: Content changes to spec

[ellie-bound1-NHSD]

Pull Request

🧾 Ticket Link

https://nhsd-jira.digital.nhs.uk/browse/NPA-6294

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📄 Description/Summary of Changes

• Content changes made to specification including changing the diagram to be the container diagram which is simpler and easier to understand
• Making sure the overview includes an explanation for PFS = Patient Facing Service

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🧪 Developer Testing Carried Out

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✅ Developer Checklist

• I have set the PR title to follow the format: NPA-XXXX: <short-description>
• My branch name follows the convention: <type>/NPA-XXXX/<short-description>
• My commit messages follow the template: NPA-XXXX: <short-description>
• I have updated the documentation accordingly
• I have set assignees and added appropriate labels

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👀 Reviewer Checklist

• Changes meet the acceptance criteria of the Jira ticket
• Code is able to be merged (no conflicts and adheres to coding standards)
• Sufficient test evidence is provided (manual and/or automated)

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Sensitive Information Declaration

To ensure the utmost confidentiality and protect your and others privacy, we kindly ask you to NOT including PII (Personal Identifiable Information) / PID (Personal Identifiable Data) or any other sensitive data in this PR (Pull Request) and the codebase changes. We will remove any PR that do contain any sensitive information. We really appreciate your cooperation in this matter.

• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[ClarksonAdam]

Some minor points to be addressed

[ClarksonAdam]

LGTM 👍