Minor cnanges to 04-patch-extraction.ipynb (#468)

- Fix spacing around backticked words.
- Unhide hidden cells. Change "tail --line 1" to "tail -n 1" Incroporate changes implrmented by pre-commit hooks.
- Change "tail --line 1" to "tail -n 1". Correct spacing around backticked word.
- Rewrite text cell on restarting runtime, and replace non-ascii right-arrow by ampersand encoding. Apply pre-commit hooks.
- Unhide hidden cells
- Rewrite text cell about restarting runtime under Colab. Replace non-ascii em-dash by " —". Pre-commit hooks.
- Redo previous commit more carefully.

Author: DavidBAEpstein

examples/04-patch-extraction.ipynb

@@ -37,8 +37,7 @@
     {
       "cell_type": "markdown",
       "metadata": {
-        "id": "ry2lYrQgZrxH",
-        "nbsphinx": "hidden"
+        "id": "ry2lYrQgZrxH"
       },
       "source": [
         "## Setting up the environment\n",
@@ -57,13 +56,12 @@
           "base_uri": "https://localhost:8080/"
         },
         "id": "MR3BWBayNg_K",
-        "nbsphinx": "hidden",
         "outputId": "7647256a-1c63-42c4-f844-549d7d6c8d13"
       },
       "outputs": [],
       "source": [
-        "!apt-get -y install libopenjp2-7-dev libopenjp2-tools openslide-tools | tail --line 1\n",
-        "!pip install tiatoolbox | tail --line 1\n",
+        "!apt-get -y install libopenjp2-7-dev libopenjp2-tools openslide-tools | tail -n 1\n",
+        "!pip install tiatoolbox | tail -n 1\n",
         "\n",
         "print(\"Installation is done.\")"
       ]
@@ -72,15 +70,14 @@
       "cell_type": "markdown",
       "metadata": {},
       "source": [
-        "> **IMPORTANT**: If you are using Colab and you run the cell above for the first time, please note that you need to restart the runtime before proceeding through (menu) *\"Runtime\u2192Restart runtime\"* . This is needed to load the latest versions of prerequisite packages installed with TIAToolbox. Doing so, you should be able to run all the remaining cells altogether (*\"Runtime\u2192Run after\"* from the next cell) or one by one.\n",
+        "**IMPORTANT**: When you run the cell above for the first time, while using Colab, you need to restart the runtime before proceeding further. Click on the box *RESTART RUNTIME* that appears immediately above this cell, or use the menu *Runtime\u2192Restart runtime*. This loads the latest versions of prerequisite packages. The notebook can then be managed normally. For example, you can run subsequent cells one by one, or you can click on *Runtime\u2192Run all* or *Runtime\u2192after*.\n",
         "\n"
       ]
     },
     {
       "cell_type": "markdown",
       "metadata": {
-        "id": "W6_DShRPqSsX",
-        "nbsphinx": "hidden"
+        "id": "W6_DShRPqSsX"
       },
       "source": [
         "### Removing leftovers from previous runs\n",
@@ -93,8 +90,7 @@
       "cell_type": "code",
       "execution_count": null,
       "metadata": {
-        "id": "kd_rQ3f_ZrxG",
-        "nbsphinx": "hidden"
+        "id": "kd_rQ3f_ZrxG"
       },
       "outputs": [],
       "source": [
@@ -642,7 +638,7 @@
       "provenance": []
     },
     "kernelspec": {
-      "display_name": "Python 3",
+      "display_name": "Python 3 (ipykernel)",
       "language": "python",
       "name": "python3"
     },
@@ -656,7 +652,7 @@
       "name": "python",
       "nbconvert_exporter": "python",
       "pygments_lexer": "ipython3",
-      "version": "3.9.5"
+      "version": "3.10.6"
     }
   },
   "nbformat": 4,