message: docs(core): fix typo and example in InjectionToken doc
  The doc included an example that didn't use InjectionToken.
diff: @@ -42,8 +42,8 @@ export class OpaqueToken {
  * runtime representation) such as when injecting an interface, callable type, array or
  * parametrized type.
  *
  - * `InjectionToken` is parametrize on `T` which is the type of object which will be returned by the
  - * `Injector`. This provides additional level of type safety.
  + * `InjectionToken` is parameterized on `T` which is the type of object which will be returned by
  + * the `Injector`. This provides additional level of type safety.
  *
  * ```
  * interface MyInterface {...}
  @@ -53,7 +53,7 @@ export class OpaqueToken {
  *
  * ### Example
  *
  - * {@example core/di/ts/injector_spec.ts region='Injector'}
  + * {@example core/di/ts/injector_spec.ts region='InjectionToken'}
  *
  * @stable
  */
  