As requested :-)

Author: ThomasLandauer

form/form_collections.rst

@@ -345,12 +345,12 @@ If you're using Stimulus, wrap everything in a ``<div>``:
 
 .. code-block:: html+twig
 
-    <div data-controller="form-collection"
+    <div {{ stimulus_controller('form-collection') }}
         data-form-collection-index-value="{{ form.tags|length > 0 ? form.tags|last.vars.name + 1 : 0 }}"
         data-form-collection-prototype-value="{{ form_widget(form.tags.vars.prototype)|e('html_attr') }}"
     >
-        <ul data-form-collection-target="collectionContainer"></ul>
-        <button type="button" data-action="form-collection#addCollectionElement">Add a tag</button>
+        <ul {{ stimulus_target('form-collection', 'collectionContainer') }}></ul>
+        <button type="button" {{ stimulus_action('form-collection', 'addCollectionElement') }}>Add a tag</button>
     </div>
 
 Then create the controller:
@@ -709,3 +709,4 @@ the relationship between the removed ``Tag`` and ``Task`` object.
 .. _`@a2lix/symfony-collection`: https://github.com/a2lix/symfony-collection
 .. _`symfony-collection`: https://github.com/ninsuo/symfony-collection
 .. _`ArrayCollection`: https://www.doctrine-project.org/projects/doctrine-collections/en/1.6/index.html
+.. _`Stimulus`: https://symfony.com/doc/current/frontend/encore/simple-example.html#stimulus-symfony-ux