Correct error BuildTemplate md link

[zhangtbj]

The original link doesn't exist and report 404 page not found. I corrected the page link to the right url.

Signed-off-by: zhangtbj [email protected]

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: zhangtbj
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[knative-prow-robot]

Hi @zhangtbj. 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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[dprotaso]

/ok-to-test
/lgtm