Fixed spacing in docs

Author: michalbundyra

docs/book/index.html

@@ -1,7 +1,7 @@
 <div class="container">
   <div class="jumbotron">
     <h1>zend-xmlrpc</h1>
-    
+
     <p>Fully-featured XML-RPC server and client implementations.</p>
 
     <pre><code class="language-bash">$ composer require zendframework/zend-xmlrpc</code></pre>