docs(guide): fix a typo in a link

Author: amilcarlucas

TUNING_GUIDE_ArduCopter.md

@@ -625,7 +625,7 @@ Land and disarm.
 > [!IMPORTANT]
 > If your vehicle is very overpowered and requires a [MOT_THST_HOVER](https://ardupilot.org/copter/docs/parameters.html#mot-thst-hover)
 > level close to or bellow 0.2 you will need to set the [MOT_HOVER_LEARN](https://ardupilot.org/copter/docs/parameters.html#mot-hover-learn)
-> parameter to 0 (using the `Add` button on the GUI) and follow the [setting hover throttle instructions](https://ardupilot.org/copter/ocs/ac_throttlemid.html)
+> parameter to 0 (using the `Add` button on the GUI) and follow the [setting hover throttle instructions](https://ardupilot.org/copter/docs/ac_throttlemid.html)
 
 Immediately check for hot motors.
 If the motors are too hot, check the `.bin` dataflash log, high or oscillating `RATE.*out` values indicate which PID gain you should reduce to remove the output oscillations causing the motors to heat up.