docs (user_workloads/monitoring): standardise format of code blocks for consistency

[jforce]

What this PR does / why we need it:
I've started to improve the code block formatting, first starting with the section user_workloads/monitoring as a taster.

Which issue(s) this PR fixes *
Part of #896)

Special notes for your reviewer:
I've done this initial PR as I was unsure whether I should do one XL PR to cover everything or break things up - (I feel that XLs could maybe be inelegant). So looking for some guidance on that. I'm fine on either approach I just didn't want to impose initially. I feel a PR per each major docs section could work best.

I've built and tested these changes locally and all look good to me.

FYI - @aburdenthehand

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[kubevirt-bot]

Hi @jforce. Thanks for your PR.

I'm waiting for a kubevirt member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[frenzyfriday]

/ok-to-test

[frenzyfriday]

/lgtm
Thank you for the PR! Personally I wouldnt mind XL PRs (in this case) but I'd wait for an opinion from someone with more experience.

[kubevirt-bot]

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/label needs-approver-review