qemu-colo.rst: Add my copyright

I have so far contributed 61 commits to the colo project, waranting
the addition of my copyright to this file.

Reviewed-by: Zhang Chen <zhangckid@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Lukas Straub <lukasstraub2@web.de>
Link: https://lore.kernel.org/qemu-devel/20260302-colo_unit_test_multifd-v11-16-d653fb3b1d80@web.de
Signed-off-by: Fabiano Rosas <farosas@suse.de>

docs/system/qemu-colo.rst

@@ -358,3 +358,4 @@ Wait until disk is synced, then::
 | Copyright (c) 2016 Intel Corporation
 | Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
 | Copyright (c) 2016 Fujitsu, Corp.
+| Copyright (c) 2026 Lukas Straub <lukasstraub2@web.de>