Update app.py

app.py

@@ -176,7 +176,7 @@ def create_pdf_from_markdown_strings(markdown_strings):
 
     return combined_html
 
-def generate_pdf(html_strings):
+def generate_pdf(html_string):
     pdf = BytesIO()
     HTML(string=html_string).write_pdf(pdf)
     pdf.seek(0)