Fix invalid tag

Author: ss23

part3.html

@@ -227,7 +227,7 @@ <h2>Loop first, ask questions later</h2>
 	<p>Read more about the while() and do-while() loops at <a href="http://www.php.net/manual/en/control-structures.while.php">http://www.php.net/manual/en/control-structures.while.php</a> and <a href="http://www.php.net/manual/en/control-structures.do.while.php">http://www.php.net/manual/en/control-structures.do.while.php</a>.</p>
 
 	<h2>Doing it by numbers</h2>
-	<p>Both the while() and do-while() loops continue to iterate for as long as the specified conditional expression remains true. But what if you need to execute a certain set of statements a specific number of times - for example, printing a series of thirteen sequential numbers, or repeating a particular set of <td> cells five times? In such cases, clever programmers reach for the for() loop...</p>
+	<p>Both the while() and do-while() loops continue to iterate for as long as the specified conditional expression remains true. But what if you need to execute a certain set of statements a specific number of times - for example, printing a series of thirteen sequential numbers, or repeating a particular set of &lt;td&gt; cells five times? In such cases, clever programmers reach for the for() loop...</p>
 	<p>The for() loop typically looks like this:</p>
 {% highlight php %}<?php
 for (initial value of counter; condition; new value of counter) {