[3.12] gh-129994: update docs when using `dualstack_ipv6` in `socket.create_server` (GH-129996) (#131891)

gh-129994: update docs when using `dualstack_ipv6` in `socket.create_server` (GH-129996)
(cherry picked from commit 044a1e13d5cfc91b0a8774e936877e91cbac3a16)

Co-authored-by: Alexander Ershov <150328014+AEErshov@users.noreply.github.com>