Clean up user prompt formatting in README

Remove formatting characters from user prompt example.

README.md

@@ -105,7 +105,7 @@ ask_mshauri(agent, "What is the inflation rate in 2023 and why is it rising?")
 ```
 **Sample Output**
 ```plaintext
-❓ User: What is the inflation rate in 2023 and why is it rising?
+User: What is the inflation rate in 2023 and why is it rising?
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 Starting Agent Loop...