update chamber temperature WIKI

doc/Chamber-temperature.md

@@ -1,4 +1,18 @@
 OrcaSlicer use `M141/M191` command to control active chamber heater. 
+
+If `Activate temperature control` is checked, OrcaSlicer will insert `M191` command at the beginning of the gcode(before `Machine G-code`). 
+![image](./images/activate_chamber_heater.jpg) 
+*Note: If the machine is equipped with an auxiliary fan, OrcaSlicer will automatically activate the fan during the heating period to help circulate air in the chamber.* 
+
+
+There are two chamber temperature variables available that we can use in `Machine G-code` to control the chamber temperature, if you prefer: 
+To access the chamber temperature set in the first filament, use: 
+`M191 S{chamber_temperature[0]}` 
+To use the overall chamber temperature, which is the highest chamber temperature set across all filaments, use: 
+`M191 S{overall_chamber_temperature}`
+
+
+--------------------------Klipper-------------------------- 
 If you are using Klipper, you can define these macros to control the active chamber heater. 
 Bellow is a reference configuration for Klipper. 
 *Note: Don't forget to change the pin name/values to the actual values you are using in the configuration*