correct README.md

exercises/exercise-grids/README.md

@@ -144,7 +144,7 @@ For this example, we can rewrite our Grid Properties to develop an ALUGrid. The
 ```c++
 GridManager<Dune::ALUGrid<dim, dimworld, elType, refinementType>>
 ```
-Our `dim` and `dimworld` will both be 2, we can use `dune:cube` as our `elType` (element type), and for the `refinementType` we can use `Dune::nonconforming`.
+Our `dim` and `dimworld` will both be 2, we can use `Dune::cube` as our `elType` (element type), and for the `refinementType` we can use `Dune::nonconforming`.
 
 There are two external structured grid files located in the `grid/` folder (`grid_structured.msh` and `grid_structured.dgf`). A path to one of these grids should be included in the input file.
 
@@ -160,7 +160,7 @@ Unstructured grids are also supported for some Dumux models. An example of an Un
 
 This grid is made up of triangles, or simplexes. This element type can be set in the grid properties section.
 
-* > __Task 5__: Change the grid property element type to include `dune::simplex` instead of `dune::cube`. Read in the unstructured grid via the input file and run the simulation.
+* > __Task 5__: Change the grid property element type to include `Dune::simplex` instead of `Dune::cube`. Read in the unstructured grid via the input file and run the simulation.