minor #2631 [LiveComponent] Remove mention of deprecated annotation in docs (smnandre)

This PR was merged into the 2.x branch.

Discussion
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[LiveComponent] Remove mention of deprecated annotation in docs

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no <!-- please update src/**/CHANGELOG.md files -->
| Issues        | Fix #...
| License       | MIT

After a question on Slack asking what was the `#[Security]` attribute :)

Commits
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a7cf2f8 [LiveComponent] Remove mention of deprecated annotation

Author: smnandre

src/LiveComponent/doc/index.rst

@@ -1047,10 +1047,11 @@ Actions
 
 Live components require a single "default action" that is used to
 re-render it. By default, this is an empty ``__invoke()`` method and can
-be added with the ``DefaultActionTrait``. Live components are actually
-Symfony controllers so you can add the normal controller
-attributes/annotations (i.e. ``#[Cache]``/``#[Security]``) to either the
-entire class just a single action.
+be added with the ``DefaultActionTrait``. 
+
+Live components __are__ actually Symfony controllers so you can add
+controller attributes (i.e. ``#[IsGranted]``) to either the entire class
+just a single action.
 
 You can also trigger custom actions on your component. Let's pretend we
 want to add a "Reset Max" button to our "random number" component