fix some typos found in doc

server/documents/introduction/variations.html.eco

@@ -13,7 +13,7 @@ type        : 'UI Introduction'
   <div class="peek">
     <div class="ui vertical pointing secondary menu">
       <a class="active item">Overview</a>
-      <a class="active item">Usage</a>
+      <a class="item">Usage</a>
     </div>
   </div>
 
@@ -129,4 +129,4 @@ type        : 'UI Introduction'
   </a>
 <!--
 
-</div>
+</div>

server/documents/project/development.html.eco

@@ -56,10 +56,7 @@ type        : 'Semantic Project'
 
   <h3 class="ui header">4) Start Your Server</h3>
 
-  <p>It's important to note that all server code exists inside of <code>/node</code> in the project. So all commands should be run relative to that directory.</p>
-
   <div class="code" data-title="Starting server locally" data-type="terminal">
-    cd node
     docpad run
   </div>
 
@@ -106,4 +103,4 @@ type        : 'Semantic Project'
     Next: Library Introduction
     <i class="right arrow icon"></i>
   </a>
-</div>
+</div>