[Svelte] Update doc for Svelte 4 support

Author: ChqThomas

src/Svelte/doc/index.rst

@@ -8,7 +8,7 @@ Svelte is a JavaScript framework for building user interfaces.
 Symfony UX Svelte provides tools to render Svelte components from Twig,
 handling rendering and data transfers.
 
-Symfony UX Svelte supports Svelte 3 only.
+Symfony UX Svelte supports Svelte 3 and Svelte 4.
 
 Installation
 ------------
@@ -35,16 +35,16 @@ Then install the bundle using Composer and Symfony Flex:
 
 The Flex recipe will automatically set things up for you, like adding
 ``.enableSvelte()`` to your ``webpack.config.js`` file and adding code
-to load your Vue components inside ``assets/app.js``.
+to load your Svelte components inside ``assets/app.js``.
 
 Next, install a package to help Svelte:
 
 .. code-block:: terminal
 
-    $ npm install svelte svelte-loader --save-dev
+    $ npm install svelte-loader --save-dev
 
     # or use yarn
-    $ yarn add svelte svelte-loader --dev
+    $ yarn add svelte-loader --dev
 
 That's it! Any files inside ``assets/svelte/controllers/`` can now be rendered as
 Svelte components.