Merge pull request #68 from ubermag/correction_in_getting_started

Correction in getting started

getting-started/magnetisation-field.ipynb

@@ -542,7 +542,7 @@
    "source": [
     "### Spatially varying $M_\\mathrm{s}$\n",
     "\n",
-    "By defining a norm of a field, we can specify different geometries. More precisely, we can set $M_\\text{s}=0$ where no magnetic material is present. For instance, let us assume we want to define a sphere of radius $r=50\\,\\text{nm}$, disrectised by 10 cells in each direction, and magnetise it in the negative $y$ direction. We can also set where we want the field to be valid, for example where the norm is not zero."
+    "By defining a norm of a field, we can specify different geometries. More precisely, we can set $M_\\text{s}=0$ where no magnetic material is present. For instance, let us assume we want to define a sphere of radius $r=50\\,\\text{nm}$, discrectised by 10 cells in each direction, and magnetise it in the negative $y$ direction. We can also set where we want the field to be valid, for example where the norm is not zero."
    ]
   },
   {