Fix code style and doc block

framework/core/src/Extension/ExtensionManager.php

@@ -223,11 +223,14 @@ class ExtensionManager
      *
      * @param Extension $extension
      * @param bool|true $up
-     * @return array Notes from the migrator.
+     * @return void
      */
     public function migrate(Extension $extension, $up = true)
     {
-        if ($extension->hasMigrations()) {
+        if (! $extension->hasMigrations()) {
+            return;
+        }
+
         $migrationDir = $extension->getPath().'/migrations';
 
         $this->app->bind('Illuminate\Database\Schema\Builder', function ($container) {
@@ -240,7 +243,6 @@ class ExtensionManager
             $this->migrator->reset($migrationDir, $extension);
         }
     }
-    }
 
     /**
      * Runs the database migrations to reset the database to its old state.