docs(upgrade): Small typo fix

Small typo fix

Author: bampakoa

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

@@ -974,7 +974,7 @@ code-example(format="").
 +makeExample('upgrade-phonecat/ts/typescript-conversion/app/js/phone_list/phone_list.module.ts', null, 'app/js/phone_list/phone_list.module.ts')
 
 :marked
-  Finally, we can now pull everything together in `app.module.ts`. It here we'll
+  Finally, we can now pull everything together in `app.module.ts`. We'll
   import each of the three submodule files and register them as dependencies
   of the main application module: