docs(events): update link about key policy for event bus (#31674)

### Issue # (if applicable)

N/A

### Reason for this change
The link about key policy for an Event Bus has been updated.



### Description of changes
Updated a link in docs.


### Description of how you validated changes
No tests because only docs has been changed.



### 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: mazyu36

Diff for: packages/aws-cdk-lib/aws-events/lib/event-bus.ts

@@ -353,8 +353,11 @@ export class EventBus extends EventBusBase {
       resourceName: eventBus.name,
     });
 
-    // Allow EventBridge to use customer managed key
-    // See https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-encryption-event-bus-key-policy.html
+    /**
+     * Allow EventBridge to use customer managed key
+     *
+     * @see https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-encryption-key-policy.html#eb-encryption-key-policy-bus
+     */
     if (props?.kmsKey) {
       props?.kmsKey.addToResourcePolicy(new iam.PolicyStatement({
         resources: ['*'],