docs: Amend lightsail_instance, add ipv6 as possible ip_address_type

[LucienZhang]

Description

AWS now support IPv6 only instance bundles, and ipv6 is an availabe ip_address_type. This MR is to update the document and the test.

Relations

Relates #36284

References

https://aws.amazon.com/cn/blogs/compute/announcing-ipv6-instance-bundles-and-pricing-update-on-amazon-lightsail/

Output from Acceptance Testing

% make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

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[github-actions]

Thank you for your contribution! 🚀

A new usage of AWS SDK for Go V1 was detected. Please prefer AWS SDK for Go V2 for all net-new services. If this is an enhancement or bug fix to an existing AWS SDK Go V1 based resource, this comment can be safely ignored.

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[github-actions]

Welcome @LucienZhang 👋

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