Fix up references to pixhawk.org

src/examples/hwtest/hwtest.c

@@ -34,7 +34,6 @@
  * @file hwtest.c
  *
  * Simple output test.
- * @ref Documentation https://pixhawk.org/dev/examples/write_output
  *
  * @author Lorenz Meier <lm@inf.ethz.ch>
  */

src/modules/mc_pos_control/mc_pos_control_main.cpp

@@ -39,8 +39,6 @@
  * Daniel Mellinger and Vijay Kumar. Minimum Snap Trajectory Generation and Control for Quadrotors.
  * Int. Conf. on Robotics and Automation, Shanghai, China, May 2011
  *
- * Also inspired by https://pixhawk.org/firmware/apps/fw_pos_control_l1
- *
  * The controller has two loops: P loop for position error and PID loop for velocity error.
  * Output of velocity controller is thrust vector that splitted to thrust direction
  * (i.e. rotation matrix for multicopter orientation) and thrust module (i.e. multicopter thrust itself).

src/systemcmds/ver/ver.c

@@ -262,7 +262,7 @@ int ver_main(int argc, char *argv[])
 						printf("\nWARNING   WARNING   WARNING!\n"
 						       "Revision %c has a silicon errata:\n"
 						       "%s"
-						       "\nhttps://pixhawk.org/help/errata\n\n", rev, errata);
+						       "\nhttps://docs.px4.io/en/flight_controller/silicon_errata.html\n\n", rev, errata);
 					}
 				}