Update docs for extended kubernetes version support

[sp1999]

Issue #, if available:
#2855

Description of changes:
This PR updates the docs for extended kubernetes version support.

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[sp1999]

/cherry-pick release-0.22

[eks-distro-pr-bot]

@sp1999: once the present PR merges, I will cherry-pick it on top of release-0.22 in a new PR and assign it to you.

In response to this:

/cherry-pick release-0.22

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sp1999]

/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sp1999

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• docs/OWNERS [sp1999]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.45%. Comparing base (2faeae8) to head (f461d93).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9336   +/-   ##
=======================================
  Coverage   69.45%   69.45%           
=======================================
  Files         672      672           
  Lines       49357    49357           
=======================================
  Hits        34283    34283           
  Misses      13288    13288           
  Partials     1786     1786           

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[eks-distro-pr-bot]

@sp1999: new pull request created: #9338

In response to this:

/cherry-pick release-0.22

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.