fix typo

Author: fedorov

notebooks/getting_started/part1_prerequisites.ipynb

@@ -211,7 +211,7 @@
         "id": "Z43rsoBfDnmK"
       },
       "source": [
-        "If you followed the demo above precisely, you shuld have this string in your clipboard: `1.2.840.113654.2.55.68425808326883186792123057288612355322`. This identifier is all that is needed to fetch the files contained in that DICOM study with just a single function call using `idc-index`! In the following cell these files will be downloaded to the current directory.\n",
+        "If you followed the demo above precisely, you should have this string in your clipboard: `1.2.840.113654.2.55.68425808326883186792123057288612355322`. This identifier is all that is needed to fetch the files contained in that DICOM study with just a single function call using `idc-index`! In the following cell these files will be downloaded to the current directory.\n",
         "\n",
         "Note how the download progress is reported as the files are fetched from the cloud to your computer. The study referenced above takes around 314 MB on disk if you fetch it from the IDC data release v18."
       ]
@@ -448,4 +448,4 @@
   },
   "nbformat": 4,
   "nbformat_minor": 0
-}
+}