Update README.md

NEMO/README.md

@@ -103,9 +103,9 @@ Nb_tasks| NNODES  |  SYPD     |  walltime(s)|
 1920    |  16     |     137,6 |        1489 |
 2160    |  20     |     151,4 |        1351 |
 2640    |  22     |     171,9 |	       1195 |
-3960    |  33     |     212,9 |	       996  |
+3960    |  33     |     212,9 |	        996 |
 ```
-SYPD value (Simulated year per day)  is given in the file named timing.output
+SYPD value (Simulated years per day)  is given in the file named **timing.output**
  Total           time :  926.210162 (**SYPD:   212.954** ) on MPI rank :     3960