Update alpha features table

[lbernick]

Changes

This commit adds release info to the alpha features table.

/kind documentation

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs included if any changes are user facing
• n/a Has Tests included if any functionality added or changed
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• n/a Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• n/a Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[abayer]

/approve

[vdemeester]

/lgtm

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@abayer: The specified target(s) for /test were not found.
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