gh-137113 docs: note readline no longer supported in REPL after 3.13

Doc/library/readline.rst

@@ -394,3 +394,9 @@ 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.

Doc/tutorial/interpreter.rst

@@ -33,16 +33,6 @@ Windows) at the primary prompt causes the interpreter to exit with a zero exit
 status.  If that doesn't work, you can exit the interpreter by typing the
 following command: ``quit()``.
 
-The interpreter's line-editing features include interactive editing, history
-substitution and code completion on systems that support the `GNU Readline
-<https://tiswww.case.edu/php/chet/readline/rltop.html>`_ library.
-Perhaps the quickest check to see whether command line editing is supported is
-typing :kbd:`Control-P` to the first Python prompt you get.  If it beeps, you
-have command line editing; see Appendix :ref:`tut-interacting` for an
-introduction to the keys.  If nothing appears to happen, or if ``^P`` is
-echoed, command line editing isn't available; you'll only be able to use
-backspace to remove characters from the current line.
-
 The interpreter operates somewhat like the Unix shell: when called with standard
 input connected to a tty device, it reads and executes commands interactively;
 when called with a file name argument or with a file as standard input, it reads