Update 067776.md (#696)

Updating doc about retrieving current position

Author: Lionel642

docs/devices/067776.md

@@ -36,7 +36,7 @@ Spanish models are branded as Legrand Valena Next, and models for this device de
 The current state of this cover is in the published state under the `state` property (value is `OPEN` or `CLOSE`).
 To control this cover publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/set` with payload `{"state": "OPEN"}` or `{"state": "CLOSE"}`.
 To read the current state of this cover publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/get` with payload `{"state": ""}`.
-To change the position publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/set` with payload `{"position": VALUE}` where `VALUE` is a number between `0` and `100`.
+To change the position publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/set` with payload `{"position": VALUE}` where `VALUE` is a number between `0` and `100`. To read the current position of this cover publish a message to topic `zigbee2mqtt/FRIENDLY_NAME/get` with payload `{"position": ""}`.
 
 ### Linkquality (numeric)
 Link quality (signal strength).