chore(cli): clarify the intent of notices (aws#22228)

We've recently seen lots of [confusion](aws#21902) from our users thinking the sheer display of the notice constitutes an error.
Try to clarify this isn't the case. 

----

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### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
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packages/aws-cdk/lib/notices.ts

@@ -63,7 +63,7 @@ function dataSourceReference(ignoreCache: boolean): NoticeDataSource {
 
 function finalMessage(individualMessages: string[], exampleNumber: number): string {
   return [
-    '\nNOTICES',
+    '\nNOTICES         (What\'s this? https://github.com/aws/aws-cdk/wiki/CLI-Notices)',
     ...individualMessages,
     `If you don’t want to see a notice anymore, use "cdk acknowledge <id>". For example, "cdk acknowledge ${exampleNumber}".`,
   ].join('\n\n');

packages/aws-cdk/test/notices.test.ts

@@ -390,7 +390,7 @@ describe('cli notices', () => {
       });
 
       expect(result).toEqual(`
-NOTICES
+NOTICES         (What's this? https://github.com/aws/aws-cdk/wiki/CLI-Notices)
 
 16603	Toggling off auto_delete_objects for Bucket empties the bucket