Correct syntax of build example

[johscheuer]

This PR corrects the build example which defines two build steps with the previous version only one step will be executed (this is actually an bug in knative build, I will create another issue in the according repo).

[knative-prow-robot]

Hi @johscheuer. Thanks for your PR.

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[johscheuer]

/label cherrypick-0.5

[johscheuer]

I will fix the other build docs too

[sebgoa]

that's correct, good catch

/lgtm

/ok-to-test

[imjasonh]

/lgtm

[johscheuer]

I finally reviewed and corrected all build examples

[RichieEscarez]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johscheuer, RichieEscarez

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