Fixing a typo in the "General Usage" title (#2516)

docs/devices/WV704R0A0902.md

@@ -59,7 +59,7 @@ In order to recalibrate a radiator thermostat, please perform the following;
 4. Then please twist the cap in the '-' direction for 2 seconds until the blue light comes on and the valve closes.
 5. This ensures that the radiator thermostat is applying suitable pressure to the radiator pin when it is supposed to be closed.
 
-## Gerneal usage
+## General usage
 Valve sometimes fails to respond/acknowledge a setting, just send the command again.
 
 `pi_heating_demand`: Varies the valve position dynamically as `local_temperature` approaches `occupied_heating_setpoint` to mitigate against heating overshoot.