[Map] Specify "renderer" option, even if empty

symfony/ux-map/2.19/config/packages/ux_map.yaml

@@ -1,3 +1,3 @@
 ux_map:
     # https://symfony.com/bundles/ux-map/current/index.html#available-renderers
-    # renderer: '%env(UX_MAP_DSN)%'
+    renderer: '%env(resolve:default::UX_MAP_DSN)%'

symfony/ux-map/2.19/post-install.txt

@@ -1,9 +1,6 @@
   * You're near ready to use the Symfony UX Map component. You can create your first map
-    by using the <info>Map</info> class, but you will not be able to render it yet until you:
-
-    1. Install the Symfony UX Map Bridge you want to use, they can be
-       found at <comment>https://symfony.com/bundles/ux-map/current/index.html#available-renderers</>.
-    2. Uncomment the <info># renderer: '%env(UX_MAP_DSN)%'</> line 
-       in <comment>config/packages/ux_map.yaml</>;
+    by using the <info>Map</info> class, but you will not be able to render it yet until you
+    install the Symfony UX Map Bridge you want to use, they can be found at 
+    <comment>https://symfony.com/bundles/ux-map/current/index.html#available-renderers</>.
 
   * <fg=blue>Read</> the documentation at <comment>https://symfony.com/bundles/ux-map/current/index.html</>