elaborated on doc

[[Imported from SVN: r8400]]

dune/fufem/quadraturerules/quadraturerulecache.hh

@@ -37,7 +37,8 @@ class QuadratureRuleKey
 
         /** \brief Constructor with given element type, order and refinement level
          * \param order Order of the quadrature rule
-         * \param refinement For composite rules: number of subdivision steps of the original rule
+         * \param refinement For composite rules: number of subdivision steps of the original rule [DEFAULT = 0]
+         * \param lumping whether or not we have a lumped quadrule [DEFAULT = false]
          */
         QuadratureRuleKey(const Dune::GeometryType& gt, const int order, const int refinement=0, bool lumping=false) :
             gt_(gt),
@@ -47,8 +48,10 @@ class QuadratureRuleKey
         {}
 
         /** \brief Constructor for rules to integrate analytical functions (i.e., not related to a grid)
-         * \param order Order of the quadrature rule
-         * \param refinement For composite rules: number of subdivision steps of the original rule
+         * \param dim dimension of domain
+         * \param order order of the quadrature rule
+         * \param refinement for composite rules: number of subdivision steps of the original rule [DEFAULT = 0]
+         * \param lumping whether or not we have a lumped quadrule [DEFAULT = false]
          */
         QuadratureRuleKey(const int dim, const int order, const int refinement=0, bool lumping=false) :
             gt_(Dune::GeometryType::none, dim),
@@ -57,6 +60,11 @@ class QuadratureRuleKey
             lumping_(lumping)
         {}
 
+        /** \brief defines order relation on QuadratureRuleKeys
+         *
+         *  \param other QuadratureRuleKey to compare with
+         *  \returns true if passed QRKey is 'larger' than *this
+         */
         bool operator<(const QuadratureRuleKey& other) const
         {
             if (gt_ < other.gt_)