Update installation notebook to correct Jupyter package installation instructions

Author: k-krakowski

notebooks/installation.ipynb

@@ -55,7 +55,11 @@
     "or  \n",
     "`conda activate plast`\n",
     "\n",
-    "If you plan to use Jupyter notebooks, install the `ipykernel` package as well:  \n",
+    "If you plan to use Jupyter notebooks, install the `jupyter` package as well:  \n",
+    "`mamba install jupyter`  \n",
+    "or  \n",
+    "`conda install jupyter`\n",
+    "If you use VS Code and only need notebook support through the Python extension, install just the `ipykernel` package:\n",
     "`mamba install ipykernel`  \n",
     "or  \n",
     "`conda install ipykernel`\n"