Add changelog entry

doc/modules/changes/20250106_gassmoeller

@@ -0,0 +1,9 @@
+Changed: ASPECT's boundary traction and boundary velocity manager classes are
+now also derived from the common classes Plugins::ManagerBase. In order to
+standardize the interface, the functions get_active_boundary_traction_conditions()
+and get_active_boundary_traction_names() (and their velocity counterparts)
+have been deprecated. They have been replaced by the new functions get_active_plugins(),
+get_active_plugin_boundary_indicators(), get_prescribed_boundary_traction_indicators(),
+and get_component_mask().
+<br>
+(Rene Gassmoeller, 2025/01/06)

include/aspect/boundary_traction/interface.h

@@ -136,8 +136,8 @@ namespace aspect
         get_active_plugin_boundary_indicators() const;
 
         /**
-         * Return a component masks that indicates for
-         * each boundary which components are prescribed by
+         * Return a component mask that indicates for the given
+         * @p boundary_id which traction components are prescribed by
          * this manager class. All plugins that are responsible
          * for this boundary use the same component mask.
          * The list of plugin objects can be

include/aspect/boundary_velocity/interface.h

@@ -161,8 +161,8 @@ namespace aspect
         get_active_plugin_boundary_indicators() const;
 
         /**
-         * Return a component masks that indicates for
-         * each boundary which components are prescribed by
+         * Return a component mask that indicates for the given
+         * @p boundary_id which velocity components are prescribed by
          * this manager class. All plugins that are responsible
          * for this boundary use the same component mask.
          * The list of plugin objects can be