add enum value in laravel migration code example

Example 1: laravel enum migration

Add Laravel enmu migration : 
------------------------------
$table->enum('question_type', ['objective', 'subjective', 'multiple_choice']);

Update Laravel enum migration :
---------------------------------
DB::statement("ALTER TABLE users CHANGE COLUMN permissions permissions ENUM('admin', 'user', 'candidate') NOT NULL DEFAULT 'user'");

Example 2: Laravel Migration - Update Enum Options

DB::statement("ALTER TABLE users CHANGE COLUMN permissions permissions ENUM('admin', 'user', 'candidate') NOT NULL DEFAULT 'user'");