Fix formatting instructions.md

[jvlatzko]

This must have been untested. Fixed formatting

[github-actions]

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[BethanyG]

@jvlatzko -- Thanks for reporting/PRing this issue.

It's less failed to test/proof-read and more failed to sync from upstream. All of the instructions and test data for practice exercises is synced from a central problem specifications repo.

Please see the discussion in this issue for some details as to why that's not working right now for the Python track. If you take a look at the PR list, we have quite a few merges on hold pending the resolution of the syncing considerations.