Description

Follow-up to PR: #3845

These aren't entirely DRY across content and could still do with improvements in future. For now I think they're still a valuable improvement to the prior relay host content we had (neither of which had really been updated for years).

Type of change

• Improvement (non-breaking change that does improve existing functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (README.md or the documentation under docs/)
• New and existing unit tests pass locally with my changes
• I have added information about changes made in this PR to CHANGELOG.md

Release PR can probably just have an entry linking to multiple docs PRs 👍