Fix check_spelling exit codes, speed plus cosmetics

[mazzystr]

What this PR does / why we need it: Fix check_spelling exit codes, speed plus cosmetics

Does this PR fix any issue?: Fixes #730 Fixes #744

Special notes for your reviewer:

Check for success

• Run make check_links
• Run echo $?
  • Return should be 0

Check for link failure

• Run sed -i s/node_assignment/sdfsdf/g _posts/*Advanced-scheduling-with-affinity-rules*
• Run make check_links
  • Output should be ...

• ./_site/2020/Advanced-scheduling-with-affinity-rules.html
  • External link https://kubevirt.io/user-guide/operations/sdfsdf/#affinity-and-anti-affinity failed: 404 No error

HTML-Proofer found 1 failure!

* Run `echo $?`
  * Output should be 1

### Check for selector failure
* Run `git checkout _posts/*Advanced-scheduling-with-affinity-rules*`
* Run `sed -i s/affinity-and-anti-affinity/sdfsdf/g _posts/*Advanced-scheduling-with-affinity-rules*`
* Run `make check_links`
  * Output should be ...

File: ./_site/2020/Advanced-scheduling-with-affinity-rules.html Link: https://kubevirt.io/user-guide/operations/node_assignment/#sdfsdf Test file: /src/check_selectors.js

type: assertExists

file: /src/check_selectors.js

subject: false

selector: "#sdfsdf"

FAIL 1 test executed in 1.132s, 0 passed, 1 failed, 0 dubious, 0 skipped.

Details for the 1 failed test:

In /src/check_selectors.js file: ./_site/2020/Advanced-scheduling-with-affinity-rules.html, url: https://kubevirt.io/user-guide/operations/node_assignment/#sdfsdf assertExists: Find selector: #sdfsdf make: *** [Makefile:130: check_links] Error 2

* Run `echo $?`
  * Output should be 2

[cwilkers]

I can confirm the PR works as expected, a bad link prints Error 1, (make returns 2) and on no bad links, make returns 0.

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidvossel

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/kubevirt/kubevirt.github.io/blob/source/OWNERS)~~ [davidvossel] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[davidvossel]

/lgtm