Merge pull request #33198 from henrik/patch-1

Active Storage: Explicit form field in basic example

guides/source/active_storage_overview.md

@@ -230,6 +230,10 @@ end
 
 You can create a user with an avatar:
 
+```erb
+<%= form.file_field :avatar %>
+```
+
 ```ruby
 class SignupController < ApplicationController
   def create
@@ -479,7 +483,7 @@ directly from the client to the cloud.
 
 2. Annotate file inputs with the direct upload URL.
 
-    ```ruby
+    ```erb
     <%= form.file_field :attachments, multiple: true, direct_upload: true %>
     ```
 3. That's it! Uploads begin upon form submission.