Update prolific.md typo fix

docs/examples/closed-loop-bandit-task/prolific.md

@@ -73,4 +73,4 @@ REACT_APP_useProlificId="True"
 
 - **This is it!** Running the ``autora_workflow.py`` in the ``researcher_hub`` should now result in closed-loop reinforcement learning study that recruits human participants from Prolific to participate in your web-based experiment hosted on Firebase.
 
-[Next: Custumize your experiment.](customization.md)
+[Next: Customize your experiment.](customization.md)