Fix typos

[Thabokani]

PR description

Fix typos in comments.

[github-actions]

• I thought about documentation and added the doc-change-required label to this PR if updates are required.
• I thought about the changelog and included a changelog update if required.
• If my PR includes database changes (e.g. KeyValueSegmentIdentifier) I have thought about compatibility and performed forwards and backwards compatibility tests

[macfarla]

@Thabokani thanks for your contribution - we can merge this if you add signoff to your commits - follow the instructions here - to make the DCO check pass

[Thabokani]

@Thabokani thanks for your contribution - we can merge this if you add signoff to your commits - follow the instructions here - to make the DCO check pass

@macfarla thanks for your review. I have added signoff.

[macfarla]

ok one more thing to fix - I don't have permissions to update your branch otherwise I'd do it for you - but the plugin-api hash needs updating - instructions here - that's why the unit tests are failing https://app.circleci.com/pipelines/github/hyperledger/besu/26758/workflows/0246a9b0-4020-414d-a270-3eb6027d82ba/jobs/176846

[macfarla]

Thanks for persevering @Thabokani - should merge shortly!