chore(s3): Default value documentation of blockPublicAccess is misl…

…eading (#12983)

Fixes #12978 

----

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packages/@aws-cdk/aws-s3/lib/bucket.ts

@@ -1161,8 +1161,8 @@ export interface BucketProps {
    *
    * @see https://docs.aws.amazon.com/AmazonS3/latest/dev/access-control-block-public-access.html
    *
-   * @default false New buckets and objects don't allow public access, but users can modify bucket
-   * policies or object permissions to allow public access.
+   *
+   * @default - CloudFormation defaults will apply. New buckets and objects don't allow public access, but users can modify bucket policies or object permissions to allow public access
    */
   readonly blockPublicAccess?: BlockPublicAccess;