Read Me First: Close anchor tag in code example (pull #3073)

Fix code example on the Read Me First page in the section:
"Principle 2: ARIA Can Both Cloak and Enhance, Creating Both Power and Danger".
Close  the anchor tags in the third example.

content/practices/read-me-first/read-me-first-practice.html

@@ -58,8 +58,8 @@ <h3>Principle 2: ARIA Can Both Cloak and Enhance, Creating Both Power and Danger
 &lt;/table&gt;
 &lt;ul role=&quot;navigation&quot;&gt;
   &lt;!-- This is a navigation region, not a list. --&gt;
-  &lt;li&gt;&lt;a href=&quot;uri1&quot;&gt;nav link 1&lt;/li&gt;
-  &lt;li&gt;&lt;a href=&quot;uri2&quot;&gt;nav link 2&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;uri1&quot;&gt;nav link 1&lt;/a&gt;&lt;/li&gt;
+  &lt;li&gt;&lt;a href=&quot;uri2&quot;&gt;nav link 2&lt;/a&gt;&lt;/li&gt;
   &lt;!-- ERROR! Previous list items are not in a list! --&gt;
 &lt;/ul&gt;</code></pre>
       </section>