update docs to point to relevant google groups

[amy]

What this PR does / why we need it:
Documents which Google Groups you need to join in order to see the google docs.

Which issue(s) this PR fixes
Fixes #823

Release note:

NONE

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[k8s-ci-robot]

Hi @amy. Thanks for your PR.

I'm waiting for a kubernetes-sigs or kubernetes 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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[vincepri]

/ok-to-test

[ashish-amarnath]

/lgtm

[ashish-amarnath]

/approve

[vincepri]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amy, ashish-amarnath, vincepri

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