Fix link to sched_setscheduler in QThread documentation

Change-Id: I38412a119d2a91685b3fd2e4a459d33a60b154b0
Reviewed-by: Topi Reiniö <topi.reinio@theqtcompany.com>

src/corelib/thread/qthread.cpp

@@ -303,8 +303,9 @@ QThreadPrivate::~QThreadPrivate()
     The effect of the \a priority parameter is dependent on the
     operating system's scheduling policy. In particular, the \a priority
     will be ignored on systems that do not support thread priorities
-    (such as on Linux, see http://linux.die.net/man/2/sched_setscheduler
-    for more details).
+    (such as on Linux, see the
+    \l {http://linux.die.net/man/2/sched_setscheduler}{sched_setscheduler}
+    documentation for more details).
 
     \sa run(), terminate()
 */