[Python-checkins] bpo-40360: [doc] Rephrase deprecation note about lib2to3 (GH-28122)

[miss-islington]

https://github.com/python/cpython/commit/559af7434668e2950c08389515a52eba697ef6af
commit: 559af7434668e2950c08389515a52eba697ef6af
branch: 3.10
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: miss-islington <31488909+miss-islington at users.noreply.github.com>
date: 2021-09-02T08:37:14-07:00
summary:

bpo-40360: [doc] Rephrase deprecation note about lib2to3 (GH-28122)

(cherry picked from commit f0b63d5b56a6324f5f86807d9548c7b38aa2a8f7)

Co-authored-by: Łukasz Langa <lukasz at langa.pl>

files:
M Doc/library/2to3.rst

diff --git a/Doc/library/2to3.rst b/Doc/library/2to3.rst
index 1d7bd26287290..2a13776e29336 100644
--- a/Doc/library/2to3.rst
+++ b/Doc/library/2to3.rst
@@ -464,12 +464,15 @@ and off individually.  They are described here in more detail.
 
 --------------
 
-.. deprecated:: 3.10
-   Python 3.9 will switch to a PEG parser (see :pep:`617`), and Python 3.10 may
-   include new language syntax that is not parsable by lib2to3's LL(1) parser.
-   The ``lib2to3`` module may be removed from the standard library in a future
-   Python version. Consider third-party alternatives such as `LibCST`_ or
-   `parso`_.
+.. deprecated-removed:: 3.11 3.13
+   Python 3.9 switched to a PEG parser (see :pep:`617`) while lib2to3 is
+   using a less flexible LL(1) parser.  Python 3.10 includes new language
+   syntax that is not parsable by lib2to3's LL(1) parser (see :pep:`634`).
+   The ``lib2to3`` module was marked pending for deprecation in Python 3.9
+   (raising :exc:`PendingDeprecationWarning` on import) and fully deprecated
+   in Python 3.11 (raising :exc:`DeprecationWarning`).
+   It will be removed from the standard library in Python 3.13.
+   Consider third-party alternatives such as `LibCST`_ or `parso`_.
 
 .. note::