minor #12485 Fix EvolvableLink attribute (bpolaszek)

This PR was merged into the 3.4 branch.

Discussion
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Fix EvolvableLink attribute

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`Fig\Link\Link` constructor only accepts 2 parameters, `withAttribute` must be used instead of `['as' : 'style']`. (which contains a typo btw 😃 )

Commits
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0839ba6 Fix EvolvableLink attribute

Author: javiereguiluz

web_link.rst

@@ -166,7 +166,12 @@ You can also add links to the HTTP response directly from controllers and servic
         public function index(Request $request)
         {
             $linkProvider = $request->attributes->get('_links', new GenericLinkProvider());
-            $request->attributes->set('_links', $linkProvider->withLink(new Link('preload', '/app.css', ['as' : 'style'])));
+            $request->attributes->set(
+                '_links',
+                $linkProvider->withLink(
+                    (new Link('preload', '/app.css'))->withAttribute('as', 'style')
+                )
+            );
 
             return $this->render('...');
         }