docs(apigateway): set integrationHttpMethod for vpc link integration

[tmokmss]

As written in #6404, a VPC link integration fails to deploy unless we set integrationHttpMethod prop explicitly.

In this PR we fix the sample code accordingly.

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[lpizzinidev]

I think we should also implement validation for the property and update the documentation here and here according to the docs.

[kaizencc]

@tmokmss thanks! @lpizzinidev feel free to create an issue out of that, can be addressed in a future PR

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

Pull request has been modified.

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 0b928f2
• Result: SUCCEEDED
• Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository

[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).