Indicate config is experimental

Author: rhshadrach

pandas/core/config_init.py

@@ -903,7 +903,8 @@ def register_converter_cb(key: str) -> None:
  cf.register_option(
  "python_scalars",
  False if os.environ.get("PANDAS_FUTURE_PYTHON_SCALARS", "0") == "0" else True,
- "Whether to return Python scalars instead of NumPy or PyArrow scalars",
+ "Whether to return Python scalars instead of NumPy or PyArrow scalars. "
+ "Currently experimental, setting to True is not recommended for end users.",
  validator=is_one_of_factory([True, False]),
  )