docs(custom-resources): update installLatestAwsSdk docs to specify correct version (#33664)

### Reason for this change

#31265

The above PR migrated the custom resource from `v2` to `v3`, but the documentation was not updated accordingly. This update ensures the documentation reflects the correct version.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

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

Author: longtv2222

packages/aws-cdk-lib/custom-resources/lib/aws-custom-resource/aws-custom-resource.ts

@@ -368,7 +368,7 @@ export interface AwsCustomResourceProps {
   readonly logGroup?: logs.ILogGroup;
 
   /**
-   * Whether to install the latest AWS SDK v2.
+   * Whether to install the latest AWS SDK v3.
    *
    * If not specified, this uses whatever JavaScript SDK version is the default in
    * AWS Lambda at the time of execution.