remove completed todo comment (#8209)

Author: TomeHirata

dspy/predict/react.py

@@ -196,9 +196,6 @@ def _fmt_exc(err: BaseException, *, limit: int = 5) -> str:
 trace of every module repeating the prefix.
 
 
-TOPIC 02: Handling default arguments in the Tool class.
-
-
 TOPIC 03: Simplifying ReAct's __init__ by moving modular logic to the Tool class.
     * Handling descriptions and casting.
     * Handling exceptions and error messages.