docs/stateful_set: add import section

[jreut]

Description

Add a terraform import section to the kubernetes_stateful_set resource docs.

Acceptance tests

From what I understand, this docs change does not require acceptance tests.

Release Note

Release note for CHANGELOG:

Docs: add Import section to `kubernetes_stateful_set` resource.

References

Community Note

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[hashicorp-cla]

All committers have signed the CLA.

[dak1n1]

Thanks!

[github-actions]

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