docs: convert all @experimental tags to @publicApi tags (#26595)

PR Close #26595

packages/common/src/directives/ng_component_outlet.ts

@@ -65,7 +65,7 @@ import {ComponentFactoryResolver, ComponentRef, Directive, Injector, Input, NgMo
  *
  * {@example common/ngComponentOutlet/ts/module.ts region='NgModuleFactoryExample'}
  *
- * @experimental
+ * @publicApi
  * @ngModule CommonModule
  */
 @Directive({selector: '[ngComponentOutlet]'})

packages/common/src/directives/ng_plural.ts

@@ -42,7 +42,7 @@ import {SwitchView} from './ng_switch';
  *
  * See http://cldr.unicode.org/index/cldr-spec/plural-rules
  *
- * @experimental
+ * @publicApi
  */
 @Directive({selector: '[ngPlural]'})
 export class NgPlural {
@@ -100,7 +100,7 @@ export class NgPlural {
  *
  * See {@link NgPlural} for more details and example.
  *
- * @experimental
+ * @publicApi
  */
 @Directive({selector: '[ngPluralCase]'})
 export class NgPluralCase {