Merge pull request #33440 from pwim/active-storage-link

Reference Active Storage instead of third-party libraries in guide

[ci skip]

guides/source/form_helpers.md

@@ -651,7 +651,7 @@ def upload
 end
 ```
 
-Once a file has been uploaded, there are a multitude of potential tasks, ranging from where to store the files (on disk, Amazon S3, etc) and associating them with models to resizing image files and generating thumbnails. The intricacies of this are beyond the scope of this guide, but there are several libraries designed to assist with these. Two of the better known ones are [CarrierWave](https://github.com/jnicklas/carrierwave) and [Paperclip](https://github.com/thoughtbot/paperclip).
+Once a file has been uploaded, there are a multitude of potential tasks, ranging from where to store the files (on disk, Amazon S3, etc) and associating them with models to resizing image files and generating thumbnails. [Active Storage](https://guides.rubyonrails.org/active_storage_overview.html) is designed to assist with these tasks.
 
 NOTE: If the user has not selected a file the corresponding parameter will be an empty string.