docs: value changes emits on additional events documented (#34497)

The value changes emitted additionally when enable disable were called
documented the above behaviour in AbstractControl class documentaion

Fixes #34407

PR Close #34497

packages/forms/src/model.ts

@@ -294,7 +294,8 @@ export abstract class AbstractControl {
 
   /**
    * A multicasting observable that emits an event every time the value of the control changes, in
-   * the UI or programmatically.
+   * the UI or programmatically. It also emits an event each time you call enable() or disable()
+   * without passing along {emitEvent: false} as a function argument.
    */
   // TODO(issue/24571): remove '!'.
   public readonly valueChanges !: Observable<any>;