Merge pull request rails#19734 from y-yagi/action_view_guide

remove reference to `register_javascript_expansion` and `register_stylesheet_expansion` from guide [ci skip]

Author: senny

guides/source/action_view_overview.md

@@ -435,32 +435,6 @@ config.action_controller.asset_host = "assets.example.com"
 image_tag("rails.png") # => <img src="http://assets.example.com/images/rails.png" alt="Rails" />
 ```
 
-#### register_javascript_expansion
-
-Register one or more JavaScript files to be included when symbol is passed to javascript_include_tag. This method is typically intended to be called from plugin initialization to register JavaScript files that the plugin installed in `vendor/assets/javascripts`.
-
-```ruby
-ActionView::Helpers::AssetTagHelper.register_javascript_expansion monkey: ["head", "body", "tail"]
-
-javascript_include_tag :monkey # =>
-  <script src="/assets/head.js"></script>
-  <script src="/assets/body.js"></script>
-  <script src="/assets/tail.js"></script>
-```
-
-#### register_stylesheet_expansion
-
-Register one or more stylesheet files to be included when symbol is passed to `stylesheet_link_tag`. This method is typically intended to be called from plugin initialization to register stylesheet files that the plugin installed in `vendor/assets/stylesheets`.
-
-```ruby
-ActionView::Helpers::AssetTagHelper.register_stylesheet_expansion monkey: ["head", "body", "tail"]
-
-stylesheet_link_tag :monkey # =>
-  <link href="/assets/head.css" media="screen" rel="stylesheet" />
-  <link href="/assets/body.css" media="screen" rel="stylesheet" />
-  <link href="/assets/tail.css" media="screen" rel="stylesheet" />
-```
-
 #### auto_discovery_link_tag
 
 Returns a link tag that browsers and feed readers can use to auto-detect an RSS or Atom feed.