message: docs(core): remove usage notes from ReflexiveInjector.parent property
  Properties are not allowed usage notes, and in this case the example
  is so simple it didn't warrant moving it to the overall class documentation.
  PR Close
diff: @@ -153,15 +153,6 @@ export abstract class ReflectiveInjector implements Injector {
  *
  * <!-- TODO: Add a link to the section of the user guide talking about hierarchical injection.
  * -->
  - *
  - * @usageNotes
  - * ### Example
  - *
  - * ```typescript
  - * var parent = ReflectiveInjector.resolveAndCreate([]);
  - * var child = parent.resolveAndCreateChild([]);
  - * expect(child.parent).toBe(parent);
  - * ```
  */
  abstract get parent(): Injector|null;
  