Inform user to add script in correct location into the application.js manifest file [ci skip]

use it

change the warning

railties/lib/rails/generators/rails/app/templates/app/assets/javascripts/application.js.tt

@@ -5,7 +5,7 @@
 // or any plugin's vendor/assets/javascripts directory can be referenced here using a relative path.
 //
 // It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
-// compiled file.
+// compiled file. JavaScript code in this file should be added after the last require_* statement.
 //
 // Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
 // about supported directives.

railties/lib/rails/generators/rails/plugin/templates/rails/javascripts.js

@@ -5,7 +5,7 @@
 // or any plugin's vendor/assets/javascripts directory can be referenced here using a relative path.
 //
 // It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
-// compiled file.
+// compiled file. JavaScript code in this file should be added after the last require_* statement.
 //
 // Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
 // about supported directives.