changed title of trees to workflow

index.html

@@ -64,7 +64,7 @@ <h2>checkout a repository</h2>
     </div>
     <a name="trees"></a>
     <div class="scrollblock block-trees">
-        <h2>trees</h2>
+        <h2>workflow</h2>
         <p>
             your local repository consists of three "trees" maintained by git.
             the first one is your <code>Working Directory</code> which holds the actual files.