Revert "docs: deprecate `DynamicComponentLoader` and `DebugNode.inject`"

This reverts commit a0b5964a63.

modules/angular2/src/core/debug/debug_node.ts

@@ -38,11 +38,6 @@ export class DebugNode {
 
   get source(): string { return isPresent(this._debugInfo) ? this._debugInfo.source : null; }
 
-  /**
-   * Use injector.get(token) instead.
-   *
-   * @deprecated
-   */
   inject(token: any): any { return this.injector.get(token); }
 }
 

modules/angular2/src/core/linker/dynamic_component_loader.ts

@@ -10,9 +10,7 @@ import {ComponentRef} from './component_factory';
 import {ViewContainerRef} from './view_container_ref';
 
 /**
- * Use ComponentResolver and ViewContainerRef directly.
- *
- * @deprecated
+ * Service for instantiating a Component and attaching it to a View at a specified location.
  */
 export abstract class DynamicComponentLoader {
   /**