Add some missing annotations

[MAILPOET-2429]

lib/Models/Model.php

@@ -74,6 +74,7 @@ use MailPoet\WP\Functions as WPFunctions;
  * @method $this whereRaw($clause, $parameters=array())
  * @method static $this whereRaw($clause, $parameters=array())
  * @method $this deleteMany()
+ * @method static $this deleteMany()
  * @method $this orderByDesc($column_name)
  * @method static $this orderByDesc($column_name)
  * @method $this orderByAsc($column_name)

lib/Models/Newsletter.php

@@ -22,7 +22,7 @@ use function MailPoet\Util\array_column;
 /**
  * @property int $id
  * @property string $type
- * @property object|boolean $queue
+ * @property object|array|boolean $queue
  * @property string $hash
  * @property string $sender_address
  * @property string $status

lib/Models/StatisticsNewsletters.php

@@ -2,6 +2,9 @@
 
 namespace MailPoet\Models;
 
+/**
+ * @property string|null $sent_at
+ */
 class StatisticsNewsletters extends Model {
   public static $_table = MP_STATISTICS_NEWSLETTERS_TABLE;
 

lib/Tasks/Sending.php

@@ -15,6 +15,7 @@ use function MailPoet\Util\array_column;
  * @property string|null $status
  * @property int $task_id
  * @property int $id
+ * @property int $newsletter_id
  */
 class Sending {
   const TASK_TYPE = 'sending';