Fix check_spelling exit codes plus a couple cosmetics

[mazzystr]

What this PR does / why we need it: FIXES #742

Special notes for your reviewer: Run make check_spelling 1) Initial test should fail with many spell checks. echo $? should return 2 which will be the same as the Makefile error 2) Update Line159 and invalidate url. echo $? should return 2 which will be the same as the Makefile error 3) Update Line159 and invalidate filename. echo $? should return 2 which will be the same as the Makefile error 4) Update local yaspeller,json file with errors from above (this is gonna be painful ...) and then rm -rf ./README.md. make check_spelling should complete successfully. echo $? should return 0.

[mazzystr]

@davidvossel Sorry to bug ya. We gotta get this right in order to leave travis-ci.

[cwilkers]

/lgtm

check_spelling with an error returns Error 2

[kubevirt-bot]

@cwilkers: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubevirt/kubevirt.github.io/pull/743#issuecomment-857193461): >/lgtm > >check_spelling with an error returns Error 2 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[mazzystr]

/approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidvossel, mazzystr

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