[Map] Fix doc link

As https://symfony.com/ux now redirects to the "FrontEnd page" of Symfony docs (that barely mention Symfony UX), i think directing users to the website could be less missleading.

src/Map/doc/index.rst

@@ -216,7 +216,7 @@ This bundle aims at following the same Backward Compatibility promise as
 the Symfony framework:
 https://symfony.com/doc/current/contributing/code/bc.html
 
-.. _`the Symfony UX initiative`: https://symfony.com/ux
+.. _`the Symfony UX initiative`: https://ux.symfony.com/
 .. _StimulusBundle configured in your app: https://symfony.com/bundles/StimulusBundle/current/index.html
 .. _`Google`: https://github.com/symfony/symfony-ux/blob/{version}/src/Map/src/Bridge/Google/README.md
 .. _`Leaflet`: https://github.com/symfony/symfony-ux/blob/{version}/src/Map/src/Bridge/Leaflet/README.md