Fix link to mobile pdf

Author: marijnh

html/index.html

@@ -102,7 +102,7 @@ <h2>Other pages</h2>
   <ul class="links">
     <li><a href="code">Code sandbox and exercise solutions</a></li>
     <li><a href="errata.html">Errata for the paper book</a></li>
-    <li><a href="http://eloquentjavascript.net/2nd_edition/Eloquent_JavaScript.pdf">This book as a single PDF file</a> (&amp; <a href="http://eloquentjavascript.net/Eloquent_JavaScript_small.pdf">small version for mobile</a>)</li>
+    <li><a href="http://eloquentjavascript.net/2nd_edition/Eloquent_JavaScript.pdf">This book as a single PDF file</a> (&amp; <a href="http://eloquentjavascript.net/2nd_edition/Eloquent_JavaScript_small.pdf">small version for mobile</a>)</li>
     <li><a href="http://eloquentjavascript.net/2nd_edition/Eloquent_JavaScript.epub">This book as an EPUB file</a></li>
     <li><a href="http://eloquentjavascript.net/2nd_edition/Eloquent_JavaScript.mobi">This book as a MOBI (Kindle) file</a></li>
     <li><a href="http://eloquentjavascript.net/1st_edition">The first edition of the book</a></li>