Missing documentation about manually cleaning up unmanaged AWS resources before kube-aws destroy

[mumoshu]

Extracted from #539 (comment)
cc @cmcconnell1

[fejta-bot]

Issues go stale after 90d of inactivity.
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/lifecycle stale

[fejta-bot]

Stale issues rot after 30d of inactivity.
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Rotten issues close after an additional 30d of inactivity.

If this issue is safe to close now please do so with /close.

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/lifecycle rotten

[fejta-bot]

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/close

[k8s-ci-robot]

@fejta-bot: Closing this issue.

In response to this:

Rotten issues close after 30d of inactivity.
Reopen the issue with /reopen.
Mark the issue as fresh with /remove-lifecycle rotten.

Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/close

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