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Updates `update-excerpts` to support any top-level .md file (other than CHANGELOG.md), rather than just README.md. This is useful for supplemental content, such as migration guides linked from the main README file. Also makes some small improvements to the error messaging: - The list of incorrect files is now relative to, and restricted to, the package. This makes the error message simpler, and ensures that changed files in other packages don't get listed. - Adds a link to the relevant wiki docs, since this has been a source of confusion for newer contributors.