docs: update s3 bucket physical names to use amazon owned s3 buckets (#31576)

### Issue # (if applicable)

Closes #<issue number here>.

### Reason for this change

By using Amazon owned s3 bucket physical names, we remove the possibility of documenting customer owned buckets in our examples. 

### Description of changes

Change physical S3 bucket names such as `my-bucket` to Amazon owned ones such as `amzn-s3-demo-bucket`. 

### Description of how you validated changes



### 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)

----

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

Author: evzzk

CHANGELOG.md

@@ -7484,10 +7484,10 @@ const bucket = new s3.Bucket(this, 'L2Bucket');
 const bucketResource = bucket.findChild('Resource') as s3.cloudformation.BucketResource;
 
 // strongly-typed overrides
-bucketResource.propertyOverrides.bucketName = 'NewBucketName';
+bucketResource.propertyOverrides.bucketName = 'amzn-s3-demo-bucket';
 
 // weakly-typed overrides
-bucketResource.addPropertyOverride('BucketName', 'NewerBucketName');
+bucketResource.addPropertyOverride('BucketName', 'amzn-s3-demo-bucket1');
 ```
 
 ### Bug Fixes
@@ -8289,7 +8289,7 @@ new Pipeline(this, 'MyCoolPipeline', { artifactsBucket: bucket });
 You can also import a bucket by just specifying its name:
 
 ```typescript
-const bucket = Bucket.import({ bucketName: new BucketName('my-bucket') });
+const bucket = Bucket.import({ bucketName: new BucketName('amzn-s3-demo-bucket') });
 new Pipeline(this, 'MyCoolPipeline', { artifactsBucket: bucket });
 ```
 

packages/@aws-cdk-testing/framework-integ/test/aws-servicediscovery/test/integ.service-with-http-namespace.lit.js.snapshot/aws-servicediscovery-integ.assets.json

@@ -22,15 +22,15 @@
    "Type": "AWS::ServiceDiscovery::Instance",
    "Properties": {
     "InstanceAttributes": {
-     "arn": "arn:aws:s3:::mybucket"
+     "arn": "arn:aws:s3:::amzn-s3-demo-bucket"
     },
+    "InstanceId": "ervicediscoveryintegMyNamespaceNonIpServiceNonIpInstance45389A2A",
     "ServiceId": {
      "Fn::GetAtt": [
       "MyNamespaceNonIpService3B425009",
       "Id"
      ]
-    },
-    "InstanceId": "ervicediscoveryintegMyNamespaceNonIpServiceNonIpInstance45389A2A"
+    }
    }
   },
   "MyNamespaceIpService220F547F": {
@@ -57,13 +57,13 @@
      "AWS_INSTANCE_IPV4": "54.239.25.192",
      "AWS_INSTANCE_PORT": "80"
     },
+    "InstanceId": "awsservicediscoveryintegMyNamespaceIpServiceIpInstance56070746",
     "ServiceId": {
      "Fn::GetAtt": [
       "MyNamespaceIpService220F547F",
       "Id"
      ]
-    },
-    "InstanceId": "awsservicediscoveryintegMyNamespaceIpServiceIpInstance56070746"
+    }
    }
   }
  },

packages/@aws-cdk-testing/framework-integ/test/aws-servicediscovery/test/integ.service-with-http-namespace.lit.js.snapshot/aws-servicediscovery-integ.template.json

@@ -13,7 +13,7 @@ const service1 = namespace.createService('NonIpService', {
 });
 
 service1.registerNonIpInstance('NonIpInstance', {
-  customAttributes: { arn: 'arn:aws:s3:::mybucket' },
+  customAttributes: { arn: 'arn:aws:s3:::amzn-s3-demo-bucket' },
 });
 
 const service2 = namespace.createService('IpService', {

packages/@aws-cdk-testing/framework-integ/test/aws-servicediscovery/test/integ.service-with-http-namespace.lit.js.snapshot/cdk.out

@@ -336,7 +336,7 @@ class CustomStagingStack extends Stack implements IStagingResources {
 
   public addFile(asset: FileAssetSource): FileStagingLocation {
     return {
-      bucketName: 'myBucket',
+      bucketName: 'amzn-s3-demo-bucket',
       assumeRoleArn: 'myArn',
       dependencyStack: this,
     };

packages/@aws-cdk-testing/framework-integ/test/aws-servicediscovery/test/integ.service-with-http-namespace.lit.js.snapshot/integ.json

@@ -29,7 +29,7 @@ new codestar.GitHubRepository(this, 'GitHubRepo', {
   accessToken: SecretValue.secretsManager('my-github-token', {
     jsonField: 'token',
   }),
-  contentsBucket: s3.Bucket.fromBucketName(this, 'Bucket', 'bucket-name'),
+  contentsBucket: s3.Bucket.fromBucketName(this, 'Bucket', 'amzn-s3-demo-bucket'),
   contentsKey: 'import.zip',
 });
 ```

packages/@aws-cdk-testing/framework-integ/test/aws-servicediscovery/test/integ.service-with-http-namespace.lit.js.snapshot/manifest.json

@@ -62,7 +62,7 @@ import * as ec2 from 'aws-cdk-lib/aws-ec2';
 import * as s3 from 'aws-cdk-lib/aws-s3';
 
 const vpc = new ec2.Vpc(this, 'Vpc');
-const bucket = s3.Bucket.fromBucketName(this, 'bucket', 'logging-bucket');
+const bucket = s3.Bucket.fromBucketName(this, 'bucket', 'amzn-s3-demo-bucket');
 
 const cluster = new Cluster(this, 'Redshift', {
   masterUser: {

packages/@aws-cdk-testing/framework-integ/test/aws-servicediscovery/test/integ.service-with-http-namespace.lit.js.snapshot/tree.json

@@ -500,11 +500,11 @@ need to do is add a dependency between the calls. There is an helper method `nex
 declare const integ: IntegTest;
 
 integ.assertions.awsApiCall('S3', 'putObject', {
-  Bucket: 'my-bucket',
+  Bucket: 'amzn-s3-demo-bucket',
   Key: 'my-key',
   Body: 'helloWorld',
 }).next(integ.assertions.awsApiCall('S3', 'getObject', {
-  Bucket: 'my-bucket',
+  Bucket: 'amzn-s3-demo-bucket',
   Key: 'my-key',
 }));
 ```

packages/@aws-cdk-testing/framework-integ/test/aws-servicediscovery/test/integ.service-with-http-namespace.lit.ts

@@ -147,7 +147,7 @@ a stack with a synthesizer, pass it as one of its properties:
 ```ts
 new MyStack(app, 'MyStack', {
   synthesizer: new DefaultStackSynthesizer({
-    fileAssetsBucketName: 'my-orgs-asset-bucket',
+    fileAssetsBucketName: 'amzn-s3-demo-bucket',
   }),
 });
 ```
@@ -1173,7 +1173,7 @@ The `CfnResource` class allows emitting arbitrary entries in the
 new CfnResource(this, 'ResourceId', {
   type: 'AWS::S3::Bucket',
   properties: {
-    BucketName: 'bucket-name'
+    BucketName: 'amzn-s3-demo-bucket'
   },
 });
 ```
@@ -1197,7 +1197,7 @@ new CfnInclude(this, 'ID', {
       Bucket: {
         Type: 'AWS::S3::Bucket',
         Properties: {
-          BucketName: 'my-shiny-bucket'
+          BucketName: 'amzn-s3-demo-bucket'
         }
       }
     }

packages/@aws-cdk/app-staging-synthesizer-alpha/README.md

@@ -1124,15 +1124,15 @@ new cloudfront.CloudFrontWebDistribution(this, 'ADistribution', {
   originConfigs: [
     {
       s3OriginSource: {
-        s3BucketSource: s3.Bucket.fromBucketName(this, 'aBucket', 'myoriginbucket'),
+        s3BucketSource: s3.Bucket.fromBucketName(this, 'aBucket', 'amzn-s3-demo-bucket'),
         originPath: '/',
         originHeaders: {
           'myHeader': '42',
         },
         originShieldRegion: 'us-west-2',
       },
       failoverS3OriginSource: {
-        s3BucketSource: s3.Bucket.fromBucketName(this, 'aBucketFallback', 'myoriginbucketfallback'),
+        s3BucketSource: s3.Bucket.fromBucketName(this, 'aBucketFallback', 'amzn-s3-demo-bucket1'),
         originPath: '/somewhere',
         originHeaders: {
           'myHeader2': '21',