Update README.md

README.md

@@ -34,7 +34,7 @@ DecGrid<GridBase> grid(*gridBase);
 
 This grid adapter provides iterators for incidence relations, like edges of a vertex or faces of an edge.
 
-Example: Iterate over all edges of the grid (grid-view) and store the coefficients of a Grad-Div laplacian
+**Example:** Iterate over all edges of the grid (grid-view) and store the coefficients of a Grad-Div laplacian
 in a sparse matrix:
 ```c++
 auto gv = grid.leafGridView();