fix typos (#274)

tutorials/3-advanced-topics/DTAT321_scatterers.ipynb

@@ -41,11 +41,11 @@
    "source": [
     "## 1. What is a Scatterer?\n",
     "\n",
-    "Scatterers are implementations of the abstract class `Feature` that represent scattering objects (see also [features_example](features_example.ipynb)). When calculating the scattered field, they are discretized into voxels.\n",
+    "Scatterers are implementations of the abstract class `Feature` that represent scattering objects (see also [features_example](DTAT301_features.ipynb)). When calculating the scattered field, they are discretized into voxels.\n",
     "\n",
     "All physcial properties of scatterers are given in SI units, unless otherwise stated. In particular, the position of a scatterer is measured from the top left corner of the image and can either be given in meters (default) or pixels by setting the property `position_unit` to `\"meter\"` or `\"pixel\"`. The z-position of the particle can either be set as the the third element of the property `position`, or as the property `z`. The calculation of a scatterer is automatically upsampled using the `upsample` property.\n",
     "\n",
-    "All scatterers need a reference to the optical system through which they are viewed in order to calculate scale factors. This is achieved by calling an optical device from the `optics` module (see also [optics_example](optics_example.ipynb)) with the scatterer."
+    "All scatterers need a reference to the optical system through which they are viewed in order to calculate scale factors. This is achieved by calling an optical device from the `optics` module (see also [optics_example](DTAT323_optics.ipynb)) with the scatterer."
    ]
   },
   {
@@ -54,7 +54,7 @@
    "source": [
     "## 2. Setup the Optics Device \n",
     "\n",
-    "Create an optical device `optics` though which to view scatterers, in this case a fluorescence microscope implemented by the `Fluorescence` class."
+    "Create an optical device `optics` through which to view scatterers, in this case a fluorescence microscope implemented by the `Fluorescence` class."
    ]
   },
   {