docs(docs-infra): warning about upgrading to v21

Author: StephenFluin

adev/src/app/features/update/update.component.ts

@@ -107,7 +107,7 @@ export default class UpdateComponent {
   ];
   protected from = this.versions.find((version) => version.name === '20.0')!;
   protected to = this.versions.find((version) => version.name === '21.0')!;
-  protected futureVersion = 2100;
+  protected futureVersion = 2200;
 
   protected readonly steps: Step[] = RECOMMENDATIONS;