pythongh-104882: Docs: fix description of relationship between `socke…

…t.getblocking()` and `socket.gettimeout()` (python#105026)

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