Update Knative-with-PKS.md

[voor]

Proposed Changes

• Remove duplicate --filename and fix backslashes.

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow-robot]

Hi @voor. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[voor]

Duplicate of #736