Renamed internal.js pack file to admin.js (#11046)

app/javascript/packs/admin.js

@@ -1,6 +1,9 @@
 import { Application } from 'stimulus';
 import { definitionsFromContext } from 'stimulus/webpack-helpers';
 
+// This loads all the Stimulus controllers at the same time for the admin
+// section of the application.
+
 const application = Application.start();
 const context = require.context('admin/controllers', true, /.js$/);
 application.load(definitionsFromContext(context));

app/views/layouts/admin.html.erb

@@ -12,7 +12,7 @@
   <title><%= controller_name.titleize %></title>
 
   <!-- StimulusJS -->
-  <%= javascript_packs_with_chunks_tag "internal", defer: true %>
+  <%= javascript_packs_with_chunks_tag "admin", defer: true %>
 
   <script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
 

docs/admin/admin-user-interface.md

@@ -33,8 +33,10 @@ Stimulus is a modest frontend framework; its primary purpose is manipulating
 HTML. It does not provide templating features.
 
 In the Forem application, [Webpacker](/frontend/webpacker/) is used to load
-Stimulus controllers. Ideally, controllers serve as an abstraction for shared
-functionality between views.
+Stimulus controllers via the `app/javascript/packs/admin.js`
+[pack file](https://github.com/rails/webpacker/blob/master/docs/folder-structure.md#packs-aka-webpack-entries).
+Ideally, controllers serve as an abstraction for shared functionality between
+views.
 
 New controllers can be added in `/app/javascript/admin/controllers`. Unit tests
 should exist for each controller in the adjacent