fix(neg): correct 'occured' -> 'occurred' in label-propagation doc comments

[SAY-5]

Two doc comments in pkg/neg used occured instead of occurred:

• pkg/neg/metrics/metrics.go:340 — PublishLabelPropagationError
• pkg/neg/syncers/labels/labels.go:93 — publishLabelPropagationTruncationMetrics

Both are doc-only changes. go build ./pkg/neg/... stays clean against current master.

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[TortillaZHawaii]

/lgtm

thanks

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SAY-5, TortillaZHawaii

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