Fix broken links

[valtterikantanen]

This PR fixes two broken links in the documentation that were producing 404 errors.

[knative-prow]

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[linux-foundation-easycla]

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[knative-prow]

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

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[valtterikantanen]

/cherry-pick release-1.16

[knative-prow-robot]

@valtterikantanen: only knative org members may request cherry picks. If you are already part of the org, make sure to change your membership to public. Otherwise you can still do the cherry-pick manually.

In response to this:

/cherry-pick release-1.16

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