chore: fix typo in sample parallel README

[linncy]

Remove redundant dot in the ksvc yaml

"Fixes #issue-number" or "Add description of the problem this PR solves"

Proposed Changes

[linux-foundation-easycla]

• ✅login: linncy / (df54460)

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[knative-prow]

Welcome @linncy! It looks like this is your first PR to knative/docs 🎉

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[knative-prow]

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