docs(core): update stability markers for core apis

modules/@angular/core/src/application_ref.ts

@@ -36,7 +36,7 @@ var _platform: PlatformRef;
  * does not result in additional changes to any bindings (also known as
  * unidirectional data flow).
  *
- * @experimental APIs related to application bootstrap are currently under review.
+ * @stable
  */
 export function enableProdMode(): void {
   if (_runModeLocked) {
@@ -151,7 +151,7 @@ export function getPlatform(): PlatformRef {
  * A page's platform is initialized implicitly when {@link bootstrap}() is called, or
  * explicitly by calling {@link createPlatform}().
  *
- * @experimental APIs related to application bootstrap are currently under review.
+ * @stable
  */
 export abstract class PlatformRef {
   /**
@@ -344,7 +344,7 @@ export class PlatformRef_ extends PlatformRef {
  *
  * For more about Angular applications, see the documentation for {@link bootstrap}.
  *
- * @experimental APIs related to application bootstrap are currently under review.
+ * @stable
  */
 export abstract class ApplicationRef {
   /**

modules/@angular/core/src/linker/ng_module_factory.ts

@@ -21,7 +21,7 @@ import {CodegenComponentFactoryResolver, ComponentFactoryResolver} from './compo
  * `NgModuleRef` provides access to the NgModule Instance as well other objects related to this
  * NgModule Instance.
  *
- * @experimental
+ * @stable
  */
 export abstract class NgModuleRef<T> {
   /**

modules/@angular/core/src/linker/ng_module_factory_loader.ts

@@ -10,7 +10,7 @@ import {NgModuleFactory} from './ng_module_factory';
 
 /**
  * Used to load ng module factories.
- * @experimental
+ * @stable
  */
 export abstract class NgModuleFactoryLoader {
   abstract load(path: string): Promise<NgModuleFactory<any>>;

modules/@angular/core/src/metadata.ts

@@ -267,7 +267,7 @@ export interface HostListenerMetadataFactory {
 /**
  * {@link NgModuleMetadata} factory for creating annotations, decorators or DSL.
  *
- * @experimental
+ * @stable
  */
 export interface NgModuleMetadataFactory {
   (obj?: NgModuleMetadataType): NgModuleDecorator;
@@ -1109,7 +1109,7 @@ export var HostListener: HostListenerMetadataFactory = makePropDecorator(HostLis
 
 /**
  * Declares an ng module.
- * @experimental
+ * @stable
  * @Annotation
  */
 export var NgModule: NgModuleMetadataFactory =

modules/@angular/core/src/metadata/directives.ts

@@ -15,7 +15,7 @@ import {ViewEncapsulation} from './view';
 
 /**
  * Interface for creating {@link DirectiveMetadata}
- * @experimental
+ * @stable
  */
 export interface DirectiveMetadataType {
   selector?: string;
@@ -744,7 +744,7 @@ export class DirectiveMetadata extends InjectableMetadata implements DirectiveMe
 
 /**
  * Interface for creating {@link ComponentMetadataType}
- * @experimental
+ * @stable
  */
 export interface ComponentMetadataType extends DirectiveMetadataType {
   changeDetection?: ChangeDetectionStrategy;
@@ -1009,7 +1009,7 @@ export class ComponentMetadata extends DirectiveMetadata implements ComponentMet
 
 /**
  * Interface for creating {@link PipeMetadata}
- * @experimental
+ * @stable
  */
 export interface PipeMetadataType {
   name: string;

modules/@angular/core/src/metadata/ng_module.ts

@@ -12,7 +12,7 @@ import {Type} from '../type';
 /**
  * A wrapper around a module that also includes the providers.
  *
- * @experimental
+ * @stable
  */
 export interface ModuleWithProviders {
   ngModule: Type<any>;
@@ -30,7 +30,7 @@ export interface SchemaMetadata { name: string; }
  * Defines a schema that will allow any property on elements with a `-` in their name,
  * which is the common rule for custom elements.
  *
- * @experimental
+ * @stable
  */
 export const CUSTOM_ELEMENTS_SCHEMA: SchemaMetadata = {
   name: 'custom-elements'
@@ -47,7 +47,7 @@ export const NO_ERRORS_SCHEMA: SchemaMetadata = {
 
 /**
  * Interface for creating {@link NgModuleMetadata}
- * @experimental
+ * @stable
  */
 export interface NgModuleMetadataType {
   providers?: any[];
@@ -61,7 +61,7 @@ export interface NgModuleMetadataType {
 
 /**
  * Declares an Angular Module.
- * @experimental
+ * @stable
  */
 export class NgModuleMetadata extends InjectableMetadata implements NgModuleMetadataType {
   /**