[Site] fix typo on cookbook index

Author: kbond

ux.symfony.com/templates/cookbook/index.html.twig

@@ -3,7 +3,7 @@
 {% set meta = {
     title: 'Cookbook',
     title_suffix: ' - Symfony UX',
-    description: 'Symfony UX cookbook - Concrete exeample to understantd all the concepts and components of Symfony UX',
+    description: 'Symfony UX Cookbook - Concrete examples to understantd all the concepts and components of Symfony UX.',
     canonical: url('app_cookbook'),
 } %}