AP_Scripting: minor spelling fix

libraries/AP_Scripting/modules/MAVLink/Readme.md

@@ -1,5 +1,5 @@
 These .lua definition for messages can be generated using pymavlink with the following command:
-(change the last path acoordingly to place the files where you need them)
+(change the last path accordingly to place the files where you need them)
 ```
 cd ardupilot/modules/mavlink
 python ./pymavlink/tools/mavgen.py --lang Lua ./message_definitions/v1.0/all.xml --out ./modules/MAVLink