Formatting code and eliminating possible errors

Signed-off-by: Valentin Popov <info@valentineus.link>

settings.php

@@ -24,9 +24,14 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+/** @var \admin_root $ADMIN */
+
 if ($hassiteconfig) {
-    $ADMIN->add("server", new admin_externalpage("local_webhooks",
-        new lang_string("pluginname", "local_webhooks"),
-        new moodle_url("/local/webhooks/index.php")
-    ));
+    $ADMIN->add(
+        'server', new admin_externalpage(
+            'local_webhooks',
+            new lang_string('pluginname', 'local_webhooks'),
+            new moodle_url('/local/webhooks/index.php')
+        )
+    );
 }