fix: improve _prompt_bool error message in wizard (#564)

- Show 'y or n' when allow_blank=False, 'y, n, or skip' when allow_blank=True

Author: nkanu17

redisvl/migration/wizard.py

@@ -787,7 +787,8 @@ def _prompt_bool(self, label: str, allow_blank: bool = False) -> Optional[bool]:
                 return None
             if not allow_blank and value == "":
                 return False
-            print("Please answer y, n, or skip.")
+            hint = "y, n, or skip" if allow_blank else "y or n"
+            print(f"Please answer {hint}.")
 
     def _prompt_from_choices(
         self,