Doc: Update a link to Windows Sockets

The link was to `msdn.microsoft.com` which now redirects to
`docs.microsoft.com`.

While the redirection works, our script to catch broken links on
dev-snapshots builds of the documentation doesn't handle redirection
correctly, reporting it as broken.

Both to appease the broken-links script and to avoid an unneccesary
redirection, the Winsock link in `qlocalsocket.cpp` was modified to
point to the new address.

Task-number: QTBUG-96127
Pick-to: 6.2
Change-Id: Idff5c2e96f7c90259219a554f73e16c37b81cafe
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/network/socket/qlocalsocket.cpp

@@ -147,7 +147,7 @@ QT_BEGIN_NAMESPACE
 
     \list
         \li On Windows, the returned value is a
-        \l{https://msdn.microsoft.com/en-us/library/windows/desktop/ms740522(v=vs.85).aspx}
+        \l{https://docs.microsoft.com/en-us/windows/win32/winsock/socket-handles-2}
         {Winsock 2 Socket Handle}.
 
         \li On INTEGRITY, the returned value is the