docs(options): Slightly improve comments for the NodeType set type

[LaikaN57]

What this PR does / why we need it: Improves docs to help developers.

How does this change affect the cardinality of KSM: does not change cardinality

Which issue(s) this PR fixes: n/a

Updates: d1f04c2

[k8s-ci-robot]

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[LaikaN57]

cc: @mickeyzzc

[CatherineF-dev]

/hold

I might change NodeType back to string. Because got one comment that existing NodeType is a little confusing.

[dgrisonnet]

/assign @CatherineF-dev
/triage accepted