fix files tags on the header comments (#23564)

src/modules/ekf2/EKF/aid_sources/magnetometer/mag_fusion.cpp

@@ -32,7 +32,7 @@
  ****************************************************************************/
 
 /**
- * @file heading_fusion.cpp
+ * @file mag_fusion.cpp
  * Magnetometer fusion methods.
  * Equations generated using EKF/python/ekf_derivation/main.py
  *

src/modules/ekf2/EKF/aid_sources/optical_flow/optical_flow_fusion.cpp

@@ -32,7 +32,7 @@
  ****************************************************************************/
 
 /**
- * @file optflow_fusion.cpp
+ * @file optical_flow_fusion.cpp
  */
 
 #include "ekf.h"

src/modules/ekf2/EKF2.hpp

@@ -32,7 +32,7 @@
  ****************************************************************************/
 
 /**
- * @file EKF2.cpp
+ * @file EKF2.hpp
  * Implementation of the attitude and position estimator.
  *
  * @author Roman Bapst