Merge pull request #4270 from emberjs/find-record-no-push

Fix incorrect reference to `push` in the `findRecord` docs

addon/adapter.js

@@ -88,9 +88,9 @@ export default Ember.Object.extend({
   /**
     The `findRecord()` method is invoked when the store is asked for a record that
     has not previously been loaded. In response to `findRecord()` being called, you
-    should query your persistence layer for a record with the given ID. Once
-    found, you can asynchronously call the store's `push()` method to push
-    the record into the store.
+    should query your persistence layer for a record with the given ID. The `findRecord` 
+    method should return a promise that will resolve to a JavaScript object that will be 
+    normalized by the serializer.
 
     Here is an example `findRecord` implementation: