Doxygen corrections

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@7772 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/boxmodels/1p/1pvolumevariables.hh

@@ -141,7 +141,7 @@ public:
     { return fluidState_.pressure(/*phaseIdx=*/0); }
 
     /*!
-     * \brief Return the mass density \f$\mathrm{[kg/m13]}\f$ of a given phase within the
+     * \brief Return the mass density \f$\mathrm{[kg/m^3]}\f$ of a given phase within the
      *        control volume.
      */
     Scalar density() const