Fix DB::getPdo() docblock (#44403)

Author: momala454

src/Illuminate/Support/Facades/DB.php

@@ -3,7 +3,7 @@
 namespace Illuminate\Support\Facades;
 
 /**
- * @method static \Doctrine\DBAL\Driver\PDOConnection getPdo()
+ * @method static \PDO getPdo()
  * @method static \Illuminate\Database\ConnectionInterface connection(string $name = null)
  * @method static \Illuminate\Database\Query\Builder table(string $table, string $as = null)
  * @method static \Illuminate\Database\Query\Builder query()