ETCM-8543 Fix test_block_headers_have_mc_hash

[kpinter-iohk]

Description

• Adds OFFSET to test_block_headers_have_mc_hash based on specs, allowing for small discrepancy, but logging a warning
• Some improvements to docs

Checklist

• Commit sequence broadly makes sense and commits have useful messages.
• New tests are added if needed and existing tests are updated.
• Relevant logging and metrics added
• CI passes. See note on CI.
• Any changes are noted in the changelog.md for affected crate
• Self-reviewed the diff

Note on CI

If your PR is from a fork, the necessary CI jobs won't trigger automatically for security reasons.
You will need to get someone with write privileges. Please contact IOG Partner Chains developers to do this
for you.