Adapt attributions to removal of Utils::variant implementation

Amends 84c1d6572b

Change-Id: I6cf02d577babb35537338447e4918776bd3012fd
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

README.md

@@ -342,19 +342,6 @@ we thank the authors who made this possible:
   The idea and interface is based on Boost.Optional library
   authored by Fernando Luis Cacciola Carballal
 
-### MPark.Variant
-
-  MPark.Variant is an implementation of C++17 std::variant for C++11/14/17.
-
-  https://github.com/mpark/variant
-
-  QtCreator/src/libs/3rdparty/variant
-
-  Copyright Michael Park, 2015-2017
-
-  Distributed under the Boost Software License, Version 1.0.
-  (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
-
 ### std::span implementation for C++11 and later
 
   A single-header implementation of C++20's std::span, conforming to the C++20

doc/qtcreator/src/overview/creator-acknowledgements.qdoc

@@ -385,23 +385,6 @@
             \li \l{https://code.qt.io/cgit/qt-creator/qt-creator.git/tree/src/libs/3rdparty/optional}
             \endlist
 
-        \li \b{MPark.Variant}
-
-            MPark.Variant is an implementation of C++17 std::variant for C++11/14/17.
-
-            Copyright Michael Park, 2015-2017
-
-            Distributed under the \l {http://boost.org/LICENSE_1_0.txt}
-            {Boost Software License, Version 1.0}.
-            (See accompanying file LICENSE.md.)
-
-            The source code can be found here:
-            \list
-            \li \l{https://github.com/mpark/variant}
-            \li QtCreator/src/libs/3rdparty/variant
-            \li \l{https://code.qt.io/cgit/qt-creator/qt-creator.git/tree/src/libs/3rdparty/variant}
-            \endlist
-
         \li \b{std::span implementation for C++11 and later}
 
             A single-header implementation of C++20's std::span, conforming to