Updated contributing doc to correct script names

[gurjeet]

Mention the correct verify/* and update/* script names in the
contributing docs to prevent confusion for the new developers.

In passing, surrounded some command names with back-ticks.

[k8s-ci-robot]

Hi @gurjeet. Thanks for your PR.

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[gurjeet]

/assign @munnerz

[tao12345666333]

/ok-to-test

[aojea]

I think that some of these docs are outdated, i.e., the generated bindata is no longer needed IIRC, but the PR is legit, the scripts moved to folders a while ago 😄
/lgtm
/assign @BenTheElder

[BenTheElder]

/approve
yeah this doc should be rewritten from scratch, it's on my backlog.
it's well intention-ed but overly specific and likely to be eternally stale.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, gurjeet

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