chore(forms): update forms labels (#10873)

modules/@angular/forms/src/directives/reactive_directives/form_control_directive.ts

@@ -70,7 +70,7 @@ export const formControlBinding: any = {
  * }
  *  ```
  *
- *  @experimental
+ *  @stable
  */
 @Directive({selector: '[formControl]', providers: [formControlBinding], exportAs: 'ngForm'})
 

modules/@angular/forms/src/directives/reactive_directives/form_control_name.ts

@@ -92,7 +92,7 @@ export const controlNameBinding: any = {
  * }
  *  ```
  *
- *  @experimental
+ *  @stable
  */
 @Directive({selector: '[formControlName]', providers: [controlNameBinding]})
 export class FormControlName extends NgControl implements OnChanges, OnDestroy {

modules/@angular/forms/src/directives/reactive_directives/form_group_directive.ts

@@ -94,7 +94,7 @@ export const formDirectiveProvider: any = {
  * }
  *  ```
  *
- *  @experimental
+ *  @stable
  */
 @Directive({
   selector: '[formGroup]',

modules/@angular/forms/src/directives/reactive_directives/form_group_name.ts

@@ -68,7 +68,7 @@ export const formGroupNameProvider: any = {
  * This example syncs the form group for the user's name. The value and validation state of
  * this group can be accessed separately from the overall form.
  *
- * @experimental
+ * @stable
  */
 @Directive({selector: '[formGroupName]', providers: [formGroupNameProvider]})
 export class FormGroupName extends AbstractFormGroupDirective implements OnInit, OnDestroy {
@@ -131,7 +131,7 @@ export const formArrayNameProvider: any = {
  * }
  * ```
  *
- * @experimental
+ * @stable
  */
 @Directive({selector: '[formArrayName]', providers: [formArrayNameProvider]})
 export class FormArrayName extends ControlContainer implements OnInit, OnDestroy {