Update heat recovery system

src/docs/devices/Genvex-Nibe-AlphaInnotec-heat-recovery-ventilation/index.md

@@ -6,13 +6,13 @@ standard: global
 board: esp32
 ---
 
-Heat Recovery Ventilation system control via MODBUS protocol for Genvex ECO 375,
+Heat Recovery Ventilation system control via ModBUS protocol for Genvex ECO 375,
 Nibe ERS 10-500, Alpha-Innotec LG 300 ECO B(E). The ventilation unit must contain
-the Optima 260 (ES 960C) controller board, and have MODBUS enabled at 19600 baud.
+the Optima 260 (ES 960C) controller board, and have ModBUS enabled at 19600 baud.
 
-Use an RS485 transceiver like MAX485 to the device via MODBUS. Some devices come
-pre-installed with a cloud controller already plugged in to the MODBUS port, this
-should be disconnected.
+Use an RS485 transceiver like MAX485 to the device via ModBUS. Some devices come
+pre-installed with a cloud controller already plugged in to the ModBUS port, this
+has to be be disconnected (ESPHome will go instead).
 
 ![Product Image](/ECO-375-mark2-lukket.jpg)
 
@@ -705,11 +705,11 @@ button:
 ## Notes
 
 If you get CRC errors use shorter cables and double-check for the 120 Ohm termination
-resistors as per MODBUS standard.
+resistors as per ModBUS standard.
 
-The factory pre-installed cloud controller has to be
-disconnected because it acts a MODBUS Master, just like the ESPHome node configured as
-above. You can't have two MODBUS Masters in parallel like that.
+The factory pre-installed cloud controller (usually a separate box or board) has to be
+disconnected because it acts a ModBUS Master, just like the ESPHome node configured as
+above. You can't have two ModBUS RTU Masters on the same bus.
 
 These units were shipped with various controller boards inside, this configuration only
 matches Optima 260 (ES 960C).