[Silabs ] Typo fix thermostat app (#37064)

Author: Sarthak-Shaha

examples/thermostat/silabs/README.md

@@ -47,7 +47,7 @@ If the LCD is enabled, the LCD on the Silabs WSTK shows a QR Code containing the
 needed commissioning information for the BLE connection and starting the
 Rendez-vous procedure.
 
-The light switch example is intended to serve both as a means to explore the
+The thermostat example is intended to serve both as a means to explore the
 workings of Matter as well as a template for creating real products based on the
 Silicon Labs platform.