fix: typo

derive_and_min-max.py

@@ -12,4 +12,4 @@ def dfdx(x: float):
 
 if __name__ == "__main__":
     print(f"Bissect method = {bissect_method(-6, -1, dfdx)}")
-    print(f"Regula false = {regula_falsi(-6, -1, dfdx)}")
+    print(f"Regula falsi = {regula_falsi(-6, -1, dfdx)}")