Minor tweaks

Author: javiereguiluz

web_link.rst

@@ -183,18 +183,24 @@ You can also add links to the HTTP response directly from controllers and servic
         public function index(Request $request): Response
         {
             // using the addLink() shortcut provided by AbstractController
-            $this->addLink($request, (new Link(Link::REL_PRELOAD, '/app.css'))->withAttribute('as', 'style'));
+            $this->addLink($request, (new Link('preload', '/app.css'))->withAttribute('as', 'style'));
 
             // alternative if you don't want to use the addLink() shortcut
             $linkProvider = $request->attributes->get('_links', new GenericLinkProvider());
             $request->attributes->set('_links', $linkProvider->withLink(
-                (new Link(Link::REL_PRELOAD, '/app.css'))->withAttribute('as', 'style')
+                (new Link('preload', '/app.css'))->withAttribute('as', 'style')
             ));
 
             return $this->render('...');
         }
     }
 
+.. tip::
+
+    The possible values of link relations (``'preload'``, ``'preconnect'``, etc.)
+    are also defined as constants in the :class:`Symfony\\Component\\WebLink\\Link`
+    class (e.g. ``Link::REL_PRELOAD``, ``Link::REL_PRECONNECT``, etc.).
+
 .. _`WebLink`: https://github.com/symfony/web-link
 .. _`HTTP/2 Server Push`: https://tools.ietf.org/html/rfc7540#section-8.2
 .. _`Resource Hints`: https://www.w3.org/TR/resource-hints/