Changing title of initialisation maps tutorial to be clearer.

Author: michaeldenes

docs/examples/example_initialisation_maps.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Exploring the initialisation maps\n",
+    "# Exploring the plastic initialisation maps\n",
     "In this tutorial we will explore the initialisation maps offered in `plasticparcels`. Descriptions of these initialisation maps can be found [here](https://plastic.oceanparcels.org/en/latest/initialisationmaps.html). For your particular model, you can generate these maps using the `create_release_maps.py` script found in `plasticparcels.scripts`. Here, we will download the file for the `NEMO0083` model. We will also make a dummy fieldset in order to show how to create particle sets from these initialisation maps."
    ]
   },