docs(core): EventEmitter docs for isAsync defaults (#15780)

- solves #15758

packages/core/src/event_emitter.ts

@@ -64,8 +64,11 @@ export class EventEmitter<T> extends Subject<T> {
   __isAsync: boolean;
 
   /**
-   * Creates an instance of [EventEmitter], which depending on [isAsync],
+   * Creates an instance of {@link EventEmitter}, which depending on `isAsync`,
    * delivers events synchronously or asynchronously.
+   *
+   * @param isAsync By default, events are delivered synchronously (default value: `false`).
+   * Set to `true` for asynchronous event delivery.
    */
   constructor(isAsync: boolean = false) {
     super();