[3.12] gh-104882: Docs: fix description of relationship between `socket.getblocking()` and `socket.gettimeout()` (GH-105026) (#105283)

gh-104882: Docs: fix description of relationship between `socket.getblocking()` and `socket.gettimeout()` (GH-105026)
(cherry picked from commit 5a5ed7a3e616a372f054a1dd2e9a31ba32a87a67)

Co-authored-by: Joe Geisbauer <joegeisbauer@gmail.com>