Update README.md

cellular_automaton/wireworld_c++/README.md

@@ -11,7 +11,7 @@ This code sample demonstrates:
  * Creating a distributed **Graph Topology** for the Halo Exchange, i.e. `MPI_Dist_graph_create_adjacent`
  * Two different approaches for the Halo Exchange:
    1. Using **collective communication**, i.e. `MPI_Ineighbor_alltoallw`
-   1. Using  **point to point communication**, i.e.  'MPI_Isend', 'MPI_Irecv'
+   1. Using  **point to point communication**, i.e.  `MPI_Isend`, `MPI_Irecv`
 
 The code sample is structured as follows:
 
@@ -76,7 +76,7 @@ either on the command line or in your batch script, where an inputfile must be p
 ### Command line arguments
 
   * `-x [ --nprocs-x ]`: number of processes in x-direction (optional, automatically deduced)
-  * `-r [ --nprocs-y ]`: number of processes in y-direction (optional, automatically deduced)
+  * `-y [ --nprocs-y ]`: number of processes in y-direction (optional, automatically deduced)
   * `-g [ --generations ]`: number of generations simulated (default 1000)
   * `-m [ --commmode ]`: Communication Mode. `Collective` or `P2P` (default Collective)
   * `-f [ --inputfile ]`: path to wireworld input file (mandatory, flag can be obmitted) The file dimension must be divisible by the  *grid dimension.