Add QtConcurrent Examples page

The QtConcurrent examples were only discoverable from the
"All Qt Examples" page, which was very inconvenient.

This patch adds a separate page for all Qt Concurrent examples, and
links to it from the module's main page.

Pick-to: 6.5
Change-Id: Iecabd9e21033605c1ec74232ce4f3d68b0c78d82
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Jaishree Vyas <jaishree.vyas@qt.io>

src/concurrent/doc/qtconcurrent.qdocconf

@@ -15,11 +15,14 @@ qhp.QtConcurrent.virtualFolder       = qtconcurrent
 qhp.QtConcurrent.indexTitle          = Qt Concurrent
 qhp.QtConcurrent.indexRoot           =
 
-qhp.QtConcurrent.subprojects         = classes
+qhp.QtConcurrent.subprojects         = classes examples
 qhp.QtConcurrent.subprojects.classes.title = C++ Classes
 qhp.QtConcurrent.subprojects.classes.indexTitle = Qt Concurrent C++ Classes
 qhp.QtConcurrent.subprojects.classes.selectors = class fake:headerfile
 qhp.QtConcurrent.subprojects.classes.sortPages = true
+qhp.QtConcurrent.subprojects.examples.title = Qt Concurrent Examples
+qhp.QtConcurrent.subprojects.examples.indexTitle = Qt Concurrent Examples
+qhp.QtConcurrent.subprojects.examples.selectors = fake:example
 
 tagfile                 = ../../../doc/qtconcurrent/qtconcurrent.tags
 

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

@@ -0,0 +1,14 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
+
+/*!
+    \group qtconcurrentexamples
+    \title Qt Concurrent Examples
+    \brief Examples for the Qt Concurrent module
+    \ingroup all-examples
+    \ingroup qtconcurrent
+
+    The list of \l {Qt Concurrent} examples demonstrating how to use
+    Qt Concurrent API from C++.
+
+*/

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

@@ -130,6 +130,12 @@
     \include module-use.qdocinc building with qmake
     \snippet snippets/snippets.pro qmake_use
 
+    \section1 Examples
+
+    \list
+        \li \l {Qt Concurrent Examples}
+    \endlist
+
     \section1 Module Evolution
     \l{Changes to Qt Concurrent} lists important changes in the module API
     and functionality that were done for the Qt 6 series of Qt.