Doc: Add docs for QtConcurrent::{Unhandled,Exception}

Change-Id: I2a9f28e572f8e59e260f659b6d17721037cbd38e
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/concurrent/doc/src/qtconcurrent-module.qdoc

@@ -36,3 +36,17 @@
     The Qt Concurrent module extends the basic threading support found in \l{Qt Core} module and
     simplifies the development of code that can be executed in parallel on all available CPU cores.
 */
+
+/*!
+   \typedef QtConcurrent::Exception
+   \obsolete
+
+   Use QException from \l{Qt Core} instead.
+*/
+
+/*!
+   \typedef QtConcurrent::UnhandledException
+   \obsolete
+
+   Use QUnhandledException from \l{Qt Core} instead.
+*/