Update description of notebook

generate_validation_results.ipynb

@@ -5,7 +5,7 @@
    "metadata": {},
    "source": [
     "# Demonstration of validation testing with NetworkUnit by replicating the results in Gutzen et al. (2018)\n",
-    "This notebook should showcase the basic validation workflow with the [SciUnit](https://github.com/scidash/sciunit) package and the test repository [NetworkUnit](https://github.com/INM-6/NetworkUnit). Here, the results are replicated reported in\n",
+    "This notebook showcases the basic validation workflow with the [SciUnit](https://github.com/scidash/sciunit) package and the test repository [NetworkUnit](https://github.com/INM-6/NetworkUnit). Here, the results are replicated reported in\n",
     "\n",
     "Gutzen, R., von Papen, M., Trensch, G., Quaglio, P., Grün, S., and Denker, M. (2018). \n",
     "*Reproducible neural network simulations: statistical methods for model validation on the level of network activity data*\n",