[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 5a5ed7a3e6)

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

Doc/library/socket.rst

@@ -1527,7 +1527,7 @@ to sockets.
    Return ``True`` if socket is in blocking mode, ``False`` if in
    non-blocking.
 
-   This is equivalent to checking ``socket.gettimeout() == 0``.
+   This is equivalent to checking ``socket.gettimeout() != 0``.
 
    .. versionadded:: 3.7