chore(app-staging-synthesizer): remove unnecessary documentation (#25896)

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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: kaizencc

packages/@aws-cdk/app-staging-synthesizer-alpha/lib/default-staging-stack.ts

@@ -150,19 +150,13 @@ export class DefaultStagingStack extends Stack implements IStagingResources {
    * Default asset publishing role name for file (S3) assets.
    */
   private get fileRoleName() {
-    // This role name can be a maximum of 64 letters. The reason why
-    // we slice the appId and not the entire name is because this.region
-    // can be a token and we don't want to accidentally cut it off.
     return `cdk-${this.appId}-file-role-${this.region}`;
   }
 
   /**
    * Default asset publishing role name for docker (ECR) assets.
    */
   private get imageRoleName() {
-    // This role name can be a maximum of 64 letters. The reason why
-    // we slice the appId and not the entire name is because this.region
-    // can be a token and we don't want to accidentally cut it off.
     return `cdk-${this.appId}-image-role-${this.region}`;
   }