Update Hot Reload label text in template app instructions. (#11857)

* Update Hot Reload label text in template app instructions.

* label fix

packages/flutter_tools/templates/create/lib/main.dart.tmpl

@@ -30,8 +30,8 @@ class MyApp extends StatelessWidget {
         // application has a blue toolbar. Then, without quitting the app, try
         // changing the primarySwatch below to Colors.green and then invoke
         // "hot reload" (press "r" in the console where you ran "flutter run",
-        // or press Run > Hot Reload App in IntelliJ). Notice that the counter
-        // didn't reset back to zero; the application is not restarted.
+        // or press Run > Flutter Hot Reload in IntelliJ). Notice that the
+        // counter didn't reset back to zero; the application is not restarted.
         primarySwatch: Colors.blue,
       ),
       home: new MyHomePage(title: 'Flutter Demo Home Page'),