Update documentation

Author: AllenDowney

_sources/chap04.ipynb

@@ -558,7 +558,7 @@
     "Adding a parameter to a function is called **generalization** because it makes the function more general: with the previous version, the square is always the same size; with this version it can be any size.\n",
     "\n",
     "If we add another parameter, we can make it even more general.\n",
-    "The following function draws regular polygons with a given of sides."
+    "The following function draws regular polygons with a given number of sides."
    ]
   },
   {

chap04.html

@@ -674,7 +674,7 @@ <h2><span class="section-number">4.2. </span>Making a square<a class="headerlink
 </div>
 <p>Adding a parameter to a function is called <strong>generalization</strong> because it makes the function more general: with the previous version, the square is always the same size; with this version it can be any size.</p>
 <p>If we add another parameter, we can make it even more general.
-The following function draws regular polygons with a given of sides.</p>
+The following function draws regular polygons with a given number of sides.</p>
 <div class="cell docutils container">
 <div class="cell_input docutils container">
 <div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">polygon</span><span class="p">(</span><span class="n">n</span><span class="p">,</span> <span class="n">length</span><span class="p">):</span>