Remove nonsensical documentation

The documentation was copied over from the AMGStep a long time ago.
It documents parameters that aren't passed and refers to a matrix
hierarchy that isn't built.

dune/solvers/iterationsteps/istlseqilu0step.hh

@@ -27,8 +27,6 @@ class ISTLSeqILU0Step
 public:
 
     /** \brief Constructor which initializes and sets up an algebraic hierarchy
-        \param smootherArgs  Arguments for the smoother.  See the dune-istl documentation for details
-        \param coarseningCriterion  Arguments for the coarsening.  See the dune-istl documentation for details
      */
     ISTLSeqILU0Step (const MatrixType* stiffnessMatrix, 
                      VectorType& x, 
@@ -42,7 +40,7 @@ public:
         seqILU0_->pre(*this->x_,*this->rhs_);
     }
 
-    /** \brief Initialize the iteration step but don't actually build the matrix hierarchy yet */
+    /** \brief Initialize the iteration step but not carry out any preprocessing */
     ISTLSeqILU0Step (const MatrixType* stiffnessMatrix, 
              VectorType& x, 
              VectorType& rhs)