📖 chore: Correct few issues in test docs

[adityabhatia]

What this PR does / why we need it:
This PR corrects a few formatting issues and an incorrect flag reference, encountered in the test documentation.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

[k8s-ci-robot]

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[sbueringer]

Just one nit. Thx!

[sbueringer]

Thx, nice catch !

/lgtm
/approve
/ok-to-test

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 48852c150c36c45041db72db130e96c5f0fb19cf

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

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