docs: Update example w/ multi VPC association for r/aws_route53_zone

[acwwat]

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

n/a

Description

This PR is to update the private zone example in the r/aws_route53_zone doc to demonstrate how to associate multiple VPCs to a private hosted zone.

Relations

Closes #44423

References

n/a

Output from Acceptance Testing

n/a

[github-actions]

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[ewbankkit]

LGTM 🚀.

[ewbankkit]

@acwwat Thanks for the contribution 🎉 👏.

[github-actions]

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