[release-0.18] Update docs for provider support of optional configurations

[eks-distro-pr-bot]

This is an automated cherry-pick of #6538

/assign taneyland

[eks-distro-bot]

Hi @eks-distro-pr-bot. Thanks for your PR.

I'm waiting for a aws member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[taneyland]

/ok-to-test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (release-0.18@f2ac237). Click here to learn what that means.

Additional details and impacted files

@@               Coverage Diff               @@
##             release-0.18    #7329   +/-   ##
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  Coverage                ?   71.96%           
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  Files                   ?      535           
  Lines                   ?    41769           
  Branches                ?        0           
===============================================
  Hits                    ?    30061           
  Misses                  ?    10030           
  Partials                ?     1678           

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[taneyland]

/lgtm
/approve

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: taneyland

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