Update version support documentation

[sedefsavas]

/kind documentation

What this PR does / why we need it:
Update EOL dates and release versioning docs.

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

[k8s-ci-robot]

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[sedefsavas]

@richardcase could you check if I missed anything related to our versioning policy?

[richardcase]

/lgtm
/approve

[k8s-ci-robot]

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