fix typos in a5-tutorial

app/views/tutorial/a5.html

@@ -32,7 +32,7 @@ <h3 class="panel-title">Attack Mechanics</h3>
                 <ol>
                     <li>If application server is configured to run as root, an attacker can run malicious scripts (by exploiting eval family functions) or start new child processes on server</li>
                     <li>Read, write, delete files on file system. Create and run binary files</li>
-                    <li>If sever mis-configured to leak internal implementation details via cookie names or HTTP response headers, then attacker can use this information towards building site's risk profile and finding vulnerabilities
+                    <li>If the server is misconfigured to leak internal implementation details via cookie names or HTTP response headers, then attacker can use this information towards building site's risk profile and finding vulnerabilities
                     </li>
                     <li>If request body size is not limited, an attacker can upload large size of input payload, causing server run out of memory, or make processor and event loop busy.</li>
                 </ol>
@@ -129,4 +129,4 @@ <h3 class="panel-title">Source Code Example</h3>
         </div>
     </div>
 </div>
-{% endblock %}
+{% endblock %}