refactor(TelegramBotHandler): add doc block and set form_params with topic id

Author: saMahmoudzadeh

src/TelegramBotHandler.php

@@ -36,7 +36,9 @@ class TelegramBotHandler extends AbstractProcessingHandler implements HandlerInt
     private $chatId;
 
     /**
-     *
+     * If chat groups are used instead of telegram channels,
+     * and the ability to set topics on groups is enabled,
+     * this configuration can be utilized.
      * @var string|null
      */
     private $topicId;
@@ -105,7 +107,7 @@ protected function send(string $message, $option = []): void
             ];
 
             $options = [
-                'form_params' => $this->topicId === null ? $params + ['message_thread_id' => $this->topicId] : $params
+                'form_params' => $this->topicId !== null ? $params + ['message_thread_id' => $this->topicId] : $params
             ];
 
             $response = $httpClient->post($url, $options);