Fix up doc links to point to master branch

src/modules/ekf2/ekf2_main.cpp

@@ -2448,7 +2448,7 @@ 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 [ECL/EKF Overview & Tuning](https://docs.px4.io/en/advanced_config/tuning_the_ecl_ekf.html) page.
+The documentation can be found on the [ECL/EKF Overview & Tuning](https://docs.px4.io/master/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.

src/modules/micrortps_bridge/README.md

@@ -1 +1 @@
-For see a complete documentation, please follow this [link](https://dev.px4.io/en/middleware/micrortps.html)
+For see a complete documentation, please follow this [link](https://dev.px4.io/master/en/middleware/micrortps.html)

src/modules/replay/Replay.cpp

@@ -1055,7 +1055,7 @@ The module is typically used together with uORB publisher rules, to specify whic
 The replay module will just publish all messages that are found in the log. It also applies the parameters from
 the log.
 
-The replay procedure is documented on the [System-wide Replay](https://dev.px4.io/en/debug/system_wide_replay.html)
+The replay procedure is documented on the [System-wide Replay](https://dev.px4.io/master/en/debug/system_wide_replay.html)
 page.
 )DESCR_STR");
 

src/modules/vmount/vmount.cpp

@@ -601,7 +601,7 @@ static void usage()
 Mount (Gimbal) control driver. It maps several different input methods (eg. RC or MAVLink) to a configured
 output (eg. AUX channels or MAVLink).
 
-Documentation how to use it is on the [gimbal_control](https://dev.px4.io/en/advanced/gimbal_control.html) page.
+Documentation how to use it is on the [gimbal_control](https://dev.px4.io/master/en/advanced/gimbal_control.html) page.
 
 ### Implementation
 Each method is implemented in its own class, and there is a common base class for inputs and outputs.