samples: matter: Fixed QR code payload for smoke co alarm

Smoke CO alarm contains wrong QR code payload in the documentation.

Signed-off-by: Kamil Kasperczyk <[email protected]>

Author: kkasperczyk-no

samples/matter/smoke_co_alarm/README.rst

@@ -368,7 +368,7 @@ For this sample, you can use one of the following :ref:`onboarding information f
             :width: 200px
             :alt: QR code for commissioning the smoke co alarm device
 
-       - MT:6FCJ142C00KA0648G00
+       - MT:Y.K9042C00KA0648G00
        - 34970112332
 
 .. include:: ../lock/README.rst