fix link URL for issue listing

[tobyhodges]

If this pull request addresses an open issue on the repository, please add 'Closes #NN' below, where NN is the issue number.

Fixes #154

Please briefly summarise the changes made in the pull request, and the reason(s) for making these changes.

It seems this link was misconfigured in #147, so the link in CONTRIBUTING.md was pointing to example.com instead of the lesson repository. This PR corrects the URL for the link.

[github-actions]

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🔍 Inspect the changes: https://github.com/LibraryCarpentry/lc-git/compare/md-outputs..md-outputs-PR-157

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⏱️ Updated at 2023-10-18 10:52:26 +0000

[emcaulay]

Thank you, @tobyhodges ! I hadn't thought to look at the end of the MD file. Accepting your changes now!