Update app.py

app.py

@@ -49,6 +49,7 @@ async def generate_article_eng(request: ArticleRequesteng):
     - article_title: str - The title of the article.
     - main_keyword: str - The main keyword for the article.
     - target_tone: str - The target tone of the article.
+     - optional_text: str - Optional text to include in the article.
     """
     try:
         # Basic validation of the input