Fix a typo in QLocalSocket doc

Change-Id: I3047cb24051c7f25d77d5b2b86ff145a52695107
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/network/socket/qlocalsocket.cpp

@@ -51,7 +51,7 @@ QT_BEGIN_NAMESPACE
 
     On Windows this is a named pipe and on Unix this is a local domain socket.
 
-    If an error occurs, socketError() returns the type of error, and
+    If an error occurs, error() returns the type of error, and
     errorString() can be called to get a human readable description
     of what happened.