[DOC] Reference to EmberObject always without dot

CHANGELOG.md

@@ -1982,7 +1982,7 @@ var Post = DS.Model.extend({
 ```
 
 **no longer works**. Instead, you should just watch each attribute like you
-would with any `Ember.Object`:
+would with any `EmberObject`:
 
 ```javascript
 var Post = DS.Model.extend({

addon/-private/system/many-array.js

@@ -52,7 +52,7 @@ import diffArray from './diff-array';
 
   @class ManyArray
   @namespace DS
-  @extends Ember.Object
+  @extends EmberObject
   @uses Ember.MutableArray, Ember.Evented
 */
 export default EmberObject.extend(MutableArray, Evented, {

addon/-private/system/model/model.js

@@ -67,7 +67,7 @@ const retrieveFromCurrentState = computed('currentState', function(key) {
 
   @class Model
   @namespace DS
-  @extends Ember.Object
+  @extends EmberObject
   @uses Ember.Evented
 */
 const Model = EmberObject.extend(Evented, {

addon/-private/system/promise-proxies.js

@@ -40,7 +40,7 @@ export const PromiseArray = ArrayProxy.extend(PromiseProxyMixin, {
 });
 
 /**
-  A `PromiseObject` is an object that acts like both an `Ember.Object`
+  A `PromiseObject` is an object that acts like both an `EmberObject`
   and a promise. When the promise is resolved, then the resulting value
   will be set to the `PromiseObject`'s `content` property. This makes
   it easy to create data bindings with the `PromiseObject` that will

addon/serializer.js

@@ -21,7 +21,7 @@ import EmberObject from '@ember/object';
 
   @class Serializer
   @namespace DS
-  @extends Ember.Object
+  @extends EmberObject
 */
 
 export default EmberObject.extend({