Update Pulumi vs AWS CDK

[gthuang]

Hello!

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Issue details

AWS CDK on Pulumi was announced on May 4. The Pulumi vs. AWS CDK docs page should be updated to account for this.

Affected area/feature

https://www.pulumi.com/docs/intro/vs/cloud-template-transpilers/aws-cdk/

[cnunciato]

I opened https://github.com/pulumi/marketing/issues/307 after May 4 to track this, but I'll close that issue in favor of this one @gthuang.