Doc: Describe selecting run targets in kit selector

If several run targets, such as tests or AVDs are configured for
a project, users can select the one to run in the kit selector.

Task-number: QTCREATORBUG-26278
Change-Id: Iaa4828865db7be488ec426c4284573156e5131db
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

doc/qtcreator/src/projects/creator-projects-running.qdoc

@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2020 The Qt Company Ltd.
+** Copyright (C) 2021 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Creator documentation.
@@ -65,6 +65,18 @@
 
     \endlist
 
+    If your project has several run targets defined, such as
+    \l{Running Autotests}{tests}, you can select them in the kit selector.
+
+    \image qtcreator-kit-selector-run-targets.png "Run targets in the kit selector"
+
+    If you have connected \l{Mobile Platforms}{mobile devices} or
+    \l{Embedded Platforms}{embedded devices} to the development PC
+    or added virtual devices, such as \l{Managing Android Virtual Devices (AVD)}
+    {Android Virtual Devices (AVD)}, you can select them in the kit selector.
+    Select \uicontrol Manage to manage device settings. For example, you can add
+    AVDs or manually start disconnected AVDs.
+
     The \uicontrol {Application Output} pane displays the status of the
     application while it is running. You can select the \uicontrol Run button
     in the pane to re-run applications without building them first. This is