AP_Scripting: update crsf-calibrate.md install instructions

Author: andyp1per

libraries/AP_Scripting/applets/crsf-calibrate.md

@@ -6,5 +6,8 @@ You can calibrate compass, accels, gyros and trim via the menu
 
 # Operation
 
-Install the lua script in the APM/scripts directory on the flight
-controller's microSD card. Enable scripting via SCR_ENABLE.
+- Install the lua script in the APM/scripts directory on the flight
+controller's microSD card.
+- Install the helper module modules/crsf_helper.lua in the APM/scripts/modules directory on the flight
+controller's microSD card.
+- Enable scripting via SCR_ENABLE.