[FrameworkBundle] better message for disabled sessions

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -234,7 +234,7 @@ class FrameworkExtension extends Extension
 
         if ($this->isConfigEnabled($container, $config['session'])) {
             if (!\extension_loaded('session')) {
-                throw new \LogicException('PHP extension "session" is required.');
+                throw new LogicException('Session support cannot be enabled as the session extension is not installed. See https://www.php.net/session.installation for instructions.');
             }
 
             $this->sessionConfigEnabled = true;