Parameters are nowhere to be found

I’m trying to configure my landing gear and I am trying to follow this page. but NONE of the parameters they name are in my parameter list in Mission Planner.
I can’t find the parameter RCn_FUNCTION or LGR_SERVO_DEPLOY or LGR_SERVO_RETRACT or CHn_OPT.
Who writes this documentation?

That documentation was probably for ArduCopter 3.6
Some parameters got renamed for consistency in ArduCopter 4.0


If your board only has 1MB it might have the landing gear function disabled.

Those that know what features are available on which boards and at what revision of Arducopter… An “Archived” link would be one clue.