docs(ngmodule): Fix typo

closes #2073

Author: trotyl

public/docs/ts/latest/guide/ngmodule.jade

@@ -80,7 +80,7 @@ a#root_module
   This `AppModule` is about as minimal as it gets:
 +makeExample('ngmodule/ts/app/app.module.0.ts', '', 'app/app.module.ts (minimal)')(format=".")
 :marked
-  The `@NgModel` decorator defines the metadata for the module. 
+  The `@NgModule` decorator defines the metadata for the module. 
   We'll take an intuitive approach to understanding the metadata and fill in details as we go.
 
   This metadata imports a single helper module, `BrowserModule`, the module every browser app must import.