Fix closeBtn argument in notification documentation

website/more_documentation/notify_documentation.py

@@ -4,7 +4,7 @@ from ..documentation_tools import text_demo
 
 
 def main_demo() -> None:
-    ui.button('Say hi!', on_click=lambda: ui.notify('Hi!', close_button='OK'))
+    ui.button('Say hi!', on_click=lambda: ui.notify('Hi!', closeBtn='OK'))
 
 
 def more() -> None: