Merge pull request #6029 from tjhei/doxy-warns

fix two doxygen warnings

Author: naliboff

include/aspect/particle/world.h

@@ -277,6 +277,7 @@ namespace aspect
         /**
          * Read the parameters this class declares from the parameter file.
          *
+         * @param prm The ParameterHandler.
          * @param world_index Parse the parameters for the Particle world with this index.
          */
         virtual

include/aspect/utilities.h

@@ -1062,7 +1062,7 @@ namespace aspect
      * @p output_filename An optional file name into which (if present) the solver history will
      *   be written.
      *
-     * @return This function never returns normally. It always exits via an exception, either
+     * @note This function never returns normally. It always exits via an exception, either
      *   of type ExcMessage (on rank 0 of the parallel computation) or QuietException (on all
      *   other ranks).
      */