Minor fixing comment of variable.

src/Normalizer/ContentEntityDenormalizer.php

@@ -19,7 +19,7 @@ class ContentEntityDenormalizer extends JsonApiNormalizerDecoratorBase {
   protected $entityTypeManager;
 
   /**
-   * The entity type manager.
+   * The entity field manager.
    *
    * @var \Drupal\Core\Entity\EntityFieldManagerInterface
    */