Change doc snippet license

According to QUIP-18 [1], all doc snippet files should be
LicenseRef-Qt-Commercial OR BSD-3-Clause

[1]: https://contribute.qt-project.org/quips/18

Task-number: QTBUG-121787
Change-Id: I6e5bc9d05a5d510cc07a15abafe2257034562510
Reviewed-by: Kai Köhne <kai.koehne@qt.io>
(cherry picked from commit 1dbc57ad0c7bb0ca9ffeb931c836f6f9791db12f)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

doc/global/snippets/code/doc_src_port_from_qregexp.cpp

@@ -1,7 +1,7 @@
 // Copyright (C) 2022 Giuseppe D'Angelo <dangelog@gmail.com>.
 // Copyright (C) 2022 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
 // Copyright (C) 2022 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 //! [0]
 QString p("a .*|pattern");

src/network/doc/snippets/code/src_network_access_qhttpmultipart.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 //! [0]
 QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);

src/network/doc/snippets/code/src_network_access_qhttppart.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 //! [0]
 Content-Type: text/plain

src/network/doc/snippets/code/src_network_kernel_qnetworkinterface.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2018 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 //! [0]
     QNetworkInterface::interfaceFromName(name).index()

src/network/doc/snippets/code/src_network_ssl_qsslpresharedkeyauthenticator.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2018 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 //! [0]
     connect(socket, &QSslSocket::preSharedKeyAuthenticationRequired,

src/plugins/doc/snippets/code/src_plugins_platforms_qnx_qqnxwindow.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2018 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 //! [0]
     QQuickView *view = new QQuickView(parent);

src/widgets/doc/snippets/code/src_widgets_util_qscroller.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2018 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 //! [0]
     QWidget *w = ...;

src/widgets/doc/snippets/code/src_widgets_widgets_qmainwindow.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2018 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 //! [0]
     void MainWindow::createMenus()

src/widgets/doc/snippets/styles/qcustompixmapstyle.cpp

@@ -1,5 +1,5 @@
 // Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 #include "qcustompixmapstyle.h"