Fix errors found in the matplotlib notebook (#192)

* Fixed TOC.
* Fixed typos.

Author: baffelli

library_matplotlib.ipynb

@@ -11,29 +11,33 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Table of Contents\n",
-    "  - [References](#References)\n",
-    "  - [Introduction](#Introduction)\n",
-    "  - [Key Features](#Key-Features)\n",
-    "    - [Customization & Extensibility](#Customization-&-Extensibility)\n",
-    "    - [Integration with other libraries](#Integration-with-other-libraries)\n",
-    "    - [Integration with Jupyter Notebooks](#Integration-with-Jupyter-Notebooks)\n",
-    "  - [Display Basics](#Display-Basics)\n",
-    "    - [Figure](#Figure)\n",
-    "    - [Artist](#Artist)\n",
-    "    - [Axes](#Axes)\n",
-    "    - [Axis](#Axis)\n",
-    "  - [The Basics of `Figure`](#The-Basics-of-Figure)\n",
-    "    - [Helper functions](#Helper-functions)\n",
-    "    - [Displaying Multiple Outputs](#Displaying-Multiple-Outputs)\n",
-    "    - [Saving Figures in a File](#Saving-Figures-in-a-File)\n",
-    "  - [The Basics of `Axes`](#The-Basics-of-Axes)\n",
-    "    - [Labels and Text](#Labels-and-Text)\n",
-    "    - [`Axis` Scales and Ticks](#Axis-Scales-and-Ticks)\n",
-    "  - [Styling and Customizations](#Styling-and-Customizations)\n",
-    "    - [Colors](#Colors)\n",
-    "    - [Annotations and Legends](#Annotations-and-Legends)\n",
-    "  - [Plot Types](#Plot-Types)"
+    "# Table of Contents\n",
+    "  - [Visualization with Matplotlib](#Visualization-with-Matplotlib)\n",
+    "    - [References](#References)\n",
+    "    - [Introduction](#Introduction)\n",
+    "    - [Key Features](#Key-Features)\n",
+    "      - [Customization & Extensibility](#Customization-&-Extensibility)\n",
+    "      - [Integration with other libraries](#Integration-with-other-libraries)\n",
+    "      - [Integration with Jupyter Notebooks](#Integration-with-Jupyter-Notebooks)\n",
+    "    - [Display Basics: Figures and axes](#Display-Basics:-Figures-and-axes)\n",
+    "      - [Artist](#Artist)\n",
+    "      - [Axes](#Axes)\n",
+    "      - [Axis](#Axis)\n",
+    "    - [The Basics of `Figure`](#The-Basics-of-Figure)\n",
+    "      - [Helper functions](#Helper-functions)\n",
+    "      - [Displaying Multiple Outputs](#Displaying-Multiple-Outputs)\n",
+    "      - [Saving Figures in a File](#Saving-Figures-in-a-File)\n",
+    "    - [The Basics of `Axes`](#The-Basics-of-Axes)\n",
+    "      - [Labels and Text](#Labels-and-Text)\n",
+    "      - [`Axis` Scales and Ticks](#Axis-Scales-and-Ticks)\n",
+    "    - [Styling and Customizations](#Styling-and-Customizations)\n",
+    "      - [Colors](#Colors)\n",
+    "      - [Annotations and Legends](#Annotations-and-Legends)\n",
+    "    - [Plot Types](#Plot-Types)\n",
+    "    - [Directly adding drawing primitives: Artists](#Directly-adding-drawing-primitives:-Artists)\n",
+    "      - [Example: Rectangles](#Example:-Rectangles)\n",
+    "      - [Example: Circles](#Example:-Circles)\n",
+    "      - [Example: Composing patches](#Example:-Composing-patches)"
    ]
   },
   {
@@ -636,7 +640,7 @@
     "\n",
     "You can create a bar plot by using the `bar` method on an `Axes`. \n",
     "The `x` argument gives the location of the bar, `height` the height of the bar.\n",
-    "This can be a numeric vector or a list of string for categorical data:"
+    "This can be a numeric vector or a list of strings for categorical data:"
    ]
   },
   {
@@ -996,7 +1000,7 @@
    "source": [
     "**Vector fields:** `quiver(x, y, u, v)`\n",
     "If you have a vector field, you can display it using the `quiver` function.\n",
-    "For documentation, check [here](https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.quiver.html#matplotlib.axes.Axes.quiver)"
+    "For documentation, check [here](https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.quiver.html#matplotlib.axes.Axes.quiver)."
    ]
   },
   {
@@ -1202,7 +1206,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.12"
+   "version": "3.10.13"
   }
  },
  "nbformat": 4,