Fixing type-o

Author: erikvansebille

docs/user_guide/examples/tutorial_interaction.ipynb

@@ -15,7 +15,7 @@
    "id": "1",
    "metadata": {},
    "source": [
-    "In this tutorial, we show an example of the 'particle-particle-interaction' functionality in Parcels. Note that this functionality is still fairly rudimentary for now. Importantly, as particle-interaction is a many-body problem it scales as $N^2$ and can thus become very slow for large ParticleSets. There is currently **no advanced optimisation** (such as using techniques from [Smoothed Particle Hydrodynamics](https://en.wikipedia.org/wiki/Smoothed-particle_hydrodynamics)) build-in to Parcels. "
+    "In this tutorial, we show an example of the 'particle-particle-interaction' functionality in Parcels. Note that this functionality is still fairly rudimentary for now. Importantly, as particle-interaction is a many-body problem it scales as $N^2$ and can thus become very slow for large ParticleSets. There is currently **no advanced optimisation** (such as using techniques from [Smoothed Particle Hydrodynamics](https://en.wikipedia.org/wiki/Smoothed-particle_hydrodynamics)) built in to Parcels. "
    ]
   },
   {