Corrected Chapter 20 title

Author: meyerweb

index.html

@@ -40,7 +40,7 @@ <h3>Chapters</h3>
 <li><a href="17-transitions/index.html">Transitions</a></li>
 <li><a href="18-animations/index.html">Animations</a></li>
 <li><a href="19-filters-blending-clipping-masking/index.html">Filters, Blending, Clipping, and Masking</a></li>
-<li><a href="20-media-dependent-styles/index.html">Media-Dependent Styling</a></li>
+<li><a href="20-media-dependent-styles/index.html">Media-Dependent Styles</a></li>
 </ol>
 
 </main>