Clean duplicated comments

lib/generators/active_admin/webpacker/templates/active_admin.js

@@ -1,19 +1,5 @@
-// import 'active_admin/assets/stylesheets/active_admin'
-// SASS variable overrides must be declared before loading up Active Admin's styles.
-//
-// To view the variables that Active Admin provides, take a look at
-// `app/assets/stylesheets/active_admin/mixins/_variables.scss` in the
-// Active Admin source.
-//
-// For example, to change the sidebar width:
-// $sidebar-width: 242px;
-
-// Active Admin's got SASS!
+// Load Active Admin's styles into webpacker,
+// see `active_admin.scss` for customization.
 import "../stylesheets/active_admin";
 
-// Overriding any non-variable SASS must be done after the fact.
-// For example, to change the default status-tag color:
-//
-//   .status_tag { background: #6090DB; }
-
 import "@activeadmin/activeadmin";