minor #1044 Update list of possible turbo-stream actions (nicolas-grekas)

This PR was merged into the 2.x branch.

Discussion
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Update list of possible turbo-stream actions

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Tickets       | -
| License       | MIT

From https://turbo.hotwired.dev/handbook/streams

Commits
-------

a864f1a Update list of possible turbo-stream actions

Author: weaverryan

src/Turbo/doc/index.rst

@@ -369,8 +369,9 @@ Let's discover how to use Turbo Streams to enhance your `Symfony forms`_::
         </template>
     </turbo-stream>
 
-Supported actions are ``append``, ``prepend``, ``replace``, ``update``
-and ``remove``. `Read the Turbo Streams documentation for more details`_.
+Supported actions are ``append``, ``prepend``, ``replace``, ``update``,
+``remove``, ``before`` and ``after``.
+`Read the Turbo Streams documentation for more details`_.
 
 Resetting the Form
 ~~~~~~~~~~~~~~~~~~