Add list of Prow jobs to the book

[sedefsavas]

/kind documentation
What this PR does / why we need it:
This PR updates version support docs and adds existing job list to the book.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Checklist:

• squashed commits
• includes documentation
• adds unit tests
• adds or updates e2e tests

Release note:

NONE

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[Ankitasw]

I noticed some typos, otherwise LGTM

[sedefsavas]

/lgtm
/approve

[k8s-ci-robot]

@sedefsavas: you cannot LGTM your own PR.

In response to this:

/lgtm
/approve

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