AP_Scripting: add a pair of warnings about using RC set_override method

had an instance where a script was using this override and didn't failsafe as expected

Author: peterbarker

libraries/AP_Scripting/docs/docs.lua

@@ -1356,7 +1356,7 @@ local RC_Channel_ud = {}
 ---@return number
 function RC_Channel_ud:norm_input_ignore_trim() end
 
--- desc
+-- Override RC channel value.  Be wary using this override as it effectively disables RC failsafes
 ---@param PWM integer
 function RC_Channel_ud:set_override(PWM) end
 

libraries/AP_Scripting/generator/description/bindings.desc

@@ -422,6 +422,7 @@ ap_object RC_Channel method norm_input float
 ap_object RC_Channel method norm_input_dz float
 ap_object RC_Channel method get_aux_switch_pos uint8_t
 ap_object RC_Channel method norm_input_ignore_trim float
+-- be wary using this binding as it effectively disables RC failsafes!
 ap_object RC_Channel method set_override void uint16_t 0 2200 0'literal
 
 include RC_Channel/RC_Channel.h