Add documentation for Core::Id

Was changed to an alias for Utils::Id.

Change-Id: Ib1b166a27b16939f8b6c3e5888dab8248660658a
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/coreplugin/CMakeLists.txt

@@ -85,7 +85,7 @@ add_qtc_plugin(Core
     helpmanager.cpp helpmanager.h helpmanager_implementation.h
     icontext.cpp icontext.h
     icore.cpp icore.h
-    id.h
+    id.cpp id.h
     idocument.cpp idocument.h
     idocumentfactory.cpp idocumentfactory.h
     ifilewizardextension.h

src/plugins/coreplugin/coreplugin.pro

@@ -20,6 +20,7 @@ SOURCES += corejsextensions.cpp \
     fancytabwidget.cpp \
     generalsettings.cpp \
     themechooser.cpp \
+    id.cpp \
     icontext.cpp \
     jsexpander.cpp \
     messagemanager.cpp \

src/plugins/coreplugin/coreplugin.qbs

@@ -92,6 +92,7 @@ Project {
                 "icontext.h",
                 "icore.cpp",
                 "icore.h",
+                "id.cpp",
                 "id.h",
                 "idocument.cpp",
                 "idocument.h",

src/plugins/coreplugin/id.cpp

@@ -0,0 +1,32 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "id.h"
+
+/*!
+    \typedef Core::Id
+
+    Use Utils::Id instead.
+*/