[Python-checkins] [3.12] gh-105993: Add possible `None` return type to `asyncio.EventLoop.start_tls` docs (GH-105995) (#106188)

[kumaraditya303]

https://github.com/python/cpython/commit/7bdf2c16e6dc8dabfff3314b61b2db7b0e156dc3
commit: 7bdf2c16e6dc8dabfff3314b61b2db7b0e156dc3
branch: 3.12
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: kumaraditya303 <59607654+kumaraditya303 at users.noreply.github.com>
date: 2023-06-28T16:36:49+05:30
summary:

[3.12] gh-105993: Add possible `None` return type to `asyncio.EventLoop.start_tls` docs (GH-105995) (#106188)

gh-105993: Add possible `None` return type to `asyncio.EventLoop.start_tls` docs (GH-105995)
(cherry picked from commit 6b52a581c151914e59c8c367a03bc7309713a73b)

Co-authored-by: Sam Bull <git at sambull.org>

files:
M Doc/library/asyncio-eventloop.rst

diff --git a/Doc/library/asyncio-eventloop.rst b/Doc/library/asyncio-eventloop.rst
index 8d0022cc66da..38f2e2f510c1 100644
--- a/Doc/library/asyncio-eventloop.rst
+++ b/Doc/library/asyncio-eventloop.rst
@@ -895,6 +895,9 @@ TLS Upgrade
    object only because the coder caches *protocol*-side data and sporadically
    exchanges extra TLS session packets with *transport*.
 
+   In some situations (e.g. when the passed transport is already closing) this
+   may return ``None``.
+
    Parameters:
 
    * *transport* and *protocol* instances that methods like