Fix comment typos

app/Entity/AbstractEntity.php

@@ -8,7 +8,7 @@ use Kudos\Helpers\Utils;
 abstract class AbstractEntity {
 
 	/**
-	 * The entities database id
+	 * The entities' database id
 	 *
 	 * @var int
 	 */

app/Entity/SubscriptionEntity.php

@@ -49,7 +49,7 @@ class SubscriptionEntity extends AbstractEntity {
 	 */
 	public $customer_id;
 	/**
-	 * Id of transaction used to make subscription
+	 * ID of transaction used to make subscription
 	 *
 	 * @var string
 	 */