bpo-41818: ++ termios versionadded markers. (GH-27987)

overlooked in https://github.com/python/cpython/pull/23686

Doc/library/termios.rst

diff --git a/Doc/library/termios.rst b/Doc/library/termios.rst
index 8ced0bb..3b0cb60 100644
--- a/Doc/library/termios.rst
+++ b/Doc/library/termios.rst
@@ -80,6 +80,8 @@
    descriptor *fd*. Requires :const:`termios.TIOCGWINSZ` or
    :const:`termios.TIOCGSIZE`.
 
+   .. versionadded:: 3.11
+
 
 .. function:: tcsetwinsize(fd, winsize)
 
@@ -89,6 +91,8 @@
     (:const:`termios.TIOCGWINSZ`, :const:`termios.TIOCSWINSZ`);
     (:const:`termios.TIOCGSIZE`, :const:`termios.TIOCSSIZE`) to be defined.
 
+   .. versionadded:: 3.11
+
 
 .. seealso::