Correct the import explanation to include Address (#3259)

closes #3257

Author: shairez

public/docs/ts/latest/guide/reactive-forms.jade

@@ -649,8 +649,8 @@ a#data-model-form-model
 +makeExample('reactive-forms/ts/src/app/hero-detail-7.component.ts', 'address-form-group')(format=".")
 
 :marked
-  Also be sure to update the import from `data-model` so you can reference the `Hero` class:
-+makeExample('reactive-forms/ts/src/app/hero-detail-6.component.ts', 'import-hero')(format=".")
+  Also be sure to update the import from `data-model` so you can reference the `Hero` and `Address` classes:
++makeExample('reactive-forms/ts/src/app/hero-detail-7.component.ts', 'import-address')(format=".")
 
 .l-main-section
 a#set-data