Add more information about WKT (#33)

Author: lhackel-tub

docs/raw-data.ipynb

@@ -185,7 +185,7 @@
    "source": [
     "The `projection` entry encodes the CRS information in the [WKT](https://en.wikipedia.org/wiki/Well-known_text_representation_of_coordinate_reference_systems) format.\n",
     "For most use-cases, it is sufficient to know, that the combination of the CRS and `coordinates` values define the exact location of a patch.\n",
-    "For more details about what coordinate reference systems are feel free to take a look at one of the following introductory courses:\n",
+    "For more details about what coordinate reference systems are, feel free to take a look at one of the following introductory courses:\n",
     "- [earthdatascience earth-analytics course](https://www.earthdatascience.org/courses/earth-analytics/spatial-data-r/intro-to-coordinate-reference-systems/)\n",
     "- [gisbooklet](https://bookdown.org/tep/gisbooklet/introduction-to-coordinate-reference-system.html)"
    ]