Fix link to EKF tuning page

src/modules/ekf2/ekf2_main.cpp

@@ -2464,7 +2464,7 @@ int Ekf2::print_usage(const char *reason)
 ### Description
 Attitude and position estimator using an Extended Kalman Filter. It is used for Multirotors and Fixed-Wing.
 
-The documentation can be found on the [tuning_the_ecl_ekf](https://dev.px4.io/en/tutorials/tuning_the_ecl_ekf.html) page.
+The documentation can be found on the [ECL/EKF Overview & Tuning](https://docs.px4.io/en/advanced_config/tuning_the_ecl_ekf.html) page.
 
 ekf2 can be started in replay mode (`-r`): in this mode it does not access the system time, but only uses the
 timestamps from the sensor topics.