Fixed old urls in documentation

[tedhtchang]

What this PR does / why we need it:
Fixed old urls that no longer work.

Which issue(s) this PR fixes:
NONE

Does this PR introduce a user-facing change?:
NONE

[feast-ci-bot]

@tedhtchang: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[feast-ci-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: tedhtchang
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[feast-ci-bot]

Hi @tedhtchang. Thanks for your PR.

I'm waiting for a feast-dev 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[woop]

Thanks @tedhtchang