Update installation.md

doc/installation.md

@@ -19,13 +19,14 @@ found in the [Configuration guide](configuration.md).
 After these steps you can let ESPHome compile your firmware (`firmware.bin`) file. This firmware
 can then be flashed onto the device.
 
-**Note**: During compilation you might see a warning message from ESPHome, telling you:
+**Note**: During compilation you might see some warning messages from ESPHome, telling you:
 ```
 WARNING GPIO4 is a Strapping PIN and should be avoided.
+...
+WARNING GPIO2 is a Strapping PIN and should be avoided. 
 ```
-You can safely ignore this warning. GPIO4 is hard-wired in the lamp's PCB and the original firmware
-uses it as the master switch for turning on and off the LEDs. This way of using the pin does not
-pose any problems for the device.
+You can safely ignore these type of warnings. GPIO4 and GPIO2 are hard-wired in the lamp's PCB.
+The way in which the firmware uses these pins does not pose any problems for the device.
 
 Like normal with ESPHome, the first time you will have to flash the device using a serial interface.
 After this initial flashing operation, you can flash new versions of the firmware using the OTA