docs: for PR #5263

ACKNOWLEDGEMENTS.md

@@ -850,3 +850,4 @@ Further device support has been made with the assistance of users. Please consid
 - [c1em3ntchua](https://github.com/c1em3ntchua) for contributing support for EuropAce EDH3122A dehumidifier.
 - [Zankio](https://github.com/Zankio) for contributing support for Poiema SGT-F12W fan.
 - [jiriks74](https://github.com/jiriks74) for contributing support for Eta Noble humidifier.
+- [hartmms](https://github.com/hartmms) for contributing support for Recteq Deck Boss 800 grill.

DEVICES.md

@@ -630,7 +630,7 @@
 - Kogan glass 1.7L smart kettle (at least 2 different variants)
 - Korex AX-WF306N smart kettle
 - Leoffen LFIM6000 ice cube maker
-- Recteq RT-700, RT-1250, RT-B380X grills
+- Recteq RT-700, RT-800 Deck Boss, RT-1250, RT-B380X grills
 - Rohnson R-2858 SmartChef XL soft cooking air fryer
 - Setti+ KT950W smart kettle
 - Silvercrest 1.7L smart kettle