Add more guidance when Vale returns an error in Lefthook

Evan Readrequested to merge
eread/provide-more-guidance-on-vale-error into master

What does this MR do and why?

Adds more guidance for someone encountering errors with Vale and Lefthook. We're constantly keeping up-to-date with Vale updates in CI/CD and on our local machines, so we need everyone running Vale in Lefthook to do likewise.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

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