docs: readded note label to readline docs

Author: Yuheng3107

Doc/library/readline.rst

@@ -394,7 +394,8 @@ support history save/restore. ::
        def save_history(self, histfile):
            readline.set_history_length(1000)
            readline.write_history_file(histfile)
+.. note::
 
-The new :term:`REPL` introduced in version 3.13 doesn't support readline.
-However, readline can still be used by setting the :envvar:`PYTHON_BASIC_REPL`
-environment variable.
+   The new :term:`REPL` introduced in version 3.13 doesn't support readline.
+   However, readline can still be used by setting the :envvar:`PYTHON_BASIC_REPL`
+   environment variable.