Correct invalid command line

index.html

@@ -71,10 +71,10 @@
             <pre><code>$ crew update</code></pre>
           </div>
           <div class="bs-example bs-example-type">
-            <h4>Update Chromebrew itself:</h4>
+            <h4>Update Chromebrew packages:</h4>
           </div>
           <div class="highlight">
-            <pre><code>$ crew update crew</code></pre>
+            <pre><code>$ crew upgrade</code></pre>
           </div>
         </div>
       </div>