adding info for occupancy detection use (#3268)

Author: RickPizzi

docs/devices/9290030675.md

@@ -30,6 +30,13 @@ pageClass: device-page
 To initiate setup mode, press and hold the setup button on the rear of the device for 3-5 seconds until the setup light blinks red. It is now in pairing mode. When paired, the light blinks green.
 
 Please note that the setup light is below the main sensor.
+
+ ### Occupancy reporting
+By default, the sensor will report occupancy at time it is detected, then 5 seconds later, then 10 seconds later, then it will go mute.
+If you want to use this sensor for occupancy detection and not for motion (eg: keep a light on as long as you're in the room), you need to tweak the max reporting time which by default is 1h,
+and configure the sensor to report occupancy status every 15 seconds or whatever your automation needs.
+Go to the Reporting tab and change the "max rep interval" value for the occupancy attribute, then apply the change.
+
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