Add missing geps to mkdocs

[levikobi]

What type of PR is this?

What this PR does / why we need it:
/kind documentation

Which issue(s) this PR fixes:

Fixes #2112

Does this PR introduce a user-facing change?:

Added missing GEPs.

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[k8s-ci-robot]

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[adleong]

Thank you!

[robscott]

Thanks @levikobi! One small thing but otherwise LGTM.

/ok-to-test
/approve

[shaneutt]

/approve
/lgtm

[shaneutt]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adleong, levikobi, robscott, shaneutt

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