Diagnose failed checkouts
Background
checking out a repository is actually a lot of work, in fact, GitHub's actions/checkout repository is approximately twice as large as check-spelling!
Unfortunately, one of the things that can happen when people try to check out a repository is that it can fail, and it can fail for lots of reasons.
Goal
Ideally, if, when you use check-spelling, the checkout fails, you should be able to get a helpful message explaining what's going wrong with a hint about how to fix it.
If check-spelling can suggest a likely cause and solution, it will.
If it can't, it will suggest looking for a ticket for checkout-failed-unknown-cause and possibly filing one if you can't find a relevant issue. This feature will be improved in the future as other causes are analyzed.
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