docs: for PR #3736

ACKNOWLEDGEMENTS.md

@@ -1046,3 +1046,4 @@ Further device support has been made with the assistance of users. Please consid
 - [k0ff33](https://github.com/k0ff33) for contributing support for Kaisai Pro Heat+ air conditioner.
 - [uspass](https://github.com/uspass) for contributing support for Tongou TOWSMR1 20 circuit breaker.
 - [Epictek](https://github.com/Epictek) for contributing support for Fukumaru AF01-W, Petempo PAF-02 pet feeders.
+- [RichardL64](https://github.com/RichardL64) for contributing support for Herschel XLS T-MT thermostat.

DEVICES.md

@@ -210,7 +210,7 @@
 - EZAIoT R9Lite thermostat
 - EZAIoT thermostat smartplug
 - Garza thermostat
-- Herschel XLS T-PL plugin thermostat
+- Herschel XLS T-MS mains and T-PL plugin thermostats
 - Hysen HY02TP, HY08ACF, HY08WE-2, HY101RF thermostats
 - Inkbird IPT-2CH v2.0 reptile thermostat
 - Inkbird ITC306A, ITC308 thermostat smartplugs