Update app.py

app.py

@@ -205,12 +205,11 @@ def demo():
         clear_btn.click(lambda:[None,"",0,"",0,"",0], \
             inputs=None, \
             outputs=[chatbot, doc_source1, source1```
-		clear_btn.click(lambda:[None,"",0,"",0,"",0], \
+        clear_btn.click(lambda:[None,"",0,"",0,"",0], \
             inputs=None, \
             outputs=[chatbot, doc_source1, source1_page, doc_source2, source2_page, doc_source3, source3_page], \
             queue=False)
     demo.queue().launch(debug=True)
 
-
 if __name__ == "__main__":
     demo()