docs: Fix typo in kube_node_deletion_timestamp description

[grzesuav]

Signed-off-by: Grzegorz Głąb grzesuav@gmail.com

What this PR does / why we need it:
Fix typo in documentations
How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
Does not change
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

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@grzesuav: This issue is currently awaiting triage.

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[dgrisonnet]

Thanks!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dgrisonnet, grzesuav

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