correction of some typos

dune/curvedsurfacegrid/geometries/implicitsurface.hh

@@ -42,7 +42,7 @@ public:
     using T = typename Domain::value_type;
 
     Domain x = x0;
-    T tol = 2*std::numeric_limits<T>::epsilon();
+    T tol = 10*std::numeric_limits<T>::epsilon();
 
     auto phi = phi_(x);
     auto sign = phi > 0 ? 1 : phi < 0 ? -1 : 0;
@@ -115,7 +115,7 @@ public:
     using std::sqrt;
     using T = typename Domain::value_type;
 
-    T tol = 2*std::numeric_limits<T>::epsilon();
+    T tol = 10*std::numeric_limits<T>::epsilon();
 
     for (int i = 0; i < maxIter_; ++i) {
       auto phi_x = phi_(x);

dune/curvedsurfacegrid/test/convergence.cc

@@ -51,7 +51,7 @@ const int order = GEOMETRY_ORDER;
 const int quad_order = order+6;
 const int num_levels = 5;
 
-// Test Hausdorf-distance
+// Test Hausdorff-distance
 template <class Grid>
 typename Grid::ctype inf_error (const Grid& grid)
 {
@@ -74,7 +74,7 @@ typename Grid::ctype inf_error (const Grid& grid)
   return dist;
 }
 
-// Test integrated Hausdorf-distance
+// Test integrated Hausdorff-distance
 template <class Grid>
 typename Grid::ctype L2_error (const Grid& grid)
 {