[release-0.58] Fix incorrect KubevirtVmHighMemoryUsage description

[machadovilaca]

What this PR does / why we need it:

This is a manual cherry-pick of #9073

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 #

Special notes for your reviewer:

Release note:

Fix incorrect KubevirtVmHighMemoryUsage description

[enp0s3]

/approve

[kubevirt-bot]

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This pull-request has been approved by: enp0s3

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@machadovilaca: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubevirt-code-lint	df90e39	link	false	/test pull-kubevirt-code-lint-0.58
pull-kubevirt-goveralls	df90e39	link	false	/test pull-kubevirt-goveralls-0.58

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[kubevirt-commenter-bot]

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