doc: fix margins in root.html

R=rsc, r2
CC=golang-dev
https://golang.org/cl/2041041

doc/root.html

@@ -74,7 +74,7 @@ google.setOnLoadCallback(loadFeed);
   <div id="blogFeed">Loading...</div>
 </div>
 
-<p style="font-size: 1.5em; font-weight: bold;">Go is &hellip;</p>
+<p style="font-size: 1.5em; font-weight: bold; margin-top: 0;">Go is &hellip;</p>
 
 <h3>&hellip; simple</h3>
 <pre class="code">

doc/style.css

@@ -240,7 +240,6 @@ span.subtitle {
 /* Styles for the frontpage */
 
 #fp-videos {
-  margin-top: 1.5em;
   margin-left: 1em;
   margin-right: 0em;
   float: right;