Remove usage of offensive language from user-guide

[phoracek]

Is this a BUG FIX or a FEATURE ?:

/bug

What this PR does / why we need it:

Some offensive language was left in user-guide even after #661 got merged.

Special notes for your reviewer:

Release note:

NONE

[phoracek]

/assign @RamLavi

[bcrochet]

/lgtm

[qinqon]

/lgtm

[phoracek]

/retest

[qinqon]

/approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qinqon

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[qinqon]

/override pull-kubernetes-nmstate-e2e-handler-k8s

Something in the routing tables change without as expecting it.

[kubevirt-bot]

@qinqon: Overrode contexts on behalf of qinqon: pull-kubernetes-nmstate-e2e-handler-k8s

In response to this:

/override pull-kubernetes-nmstate-e2e-handler-k8s

Something in the routing tables change without as expecting it.

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