Merge pull request rails#52475 from hachi8833/update_getting_started_guide

[skip-ci][docs] Remove 'channels' from getting_started.md

Author: p8

guides/source/getting_started.md

@@ -175,7 +175,7 @@ of the files and folders that Rails creates by default:
 
 | File/Folder | Purpose |
 | ----------- | ------- |
-|app/|Contains the controllers, models, views, helpers, mailers, channels, jobs, and assets for your application. You'll focus on this folder for the remainder of this guide.|
+|app/|Contains the controllers, models, views, helpers, mailers, jobs, and assets for your application. You'll focus on this folder for the remainder of this guide.|
 |bin/|Contains the `rails` script that starts your app and can contain other scripts you use to set up, update, deploy, or run your application.|
 |config/|Contains configuration for your application's routes, database, and more. This is covered in more detail in [Configuring Rails Applications](configuring.html).|
 |config.ru|Rack configuration for Rack-based servers used to start the application. For more information about Rack, see the [Rack website](https://rack.github.io/).|