Update documentation

topics/release-notes/index.html

@@ -416,7 +416,7 @@
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 <h2 id="31x-series">3.1.x series</h2>
 <h3 id="311">3.1.1</h3>
-<p><strong>Date</strong>: <a href="https://github.com/tomchristie/django-rest-framework/issues?q=milestone%3A%223.1.1+Release%22">19th March 2015</a>.</p>
+<p><strong>Date</strong>: <a href="https://github.com/tomchristie/django-rest-framework/issues?q=milestone%3A%223.1.1+Release%22">23rd March 2015</a>.</p>
 <ul>
 <li><strong>Security fix</strong>: Escape tab switching cookie name in browsable API.</li>
 <li>Display input forms in browsable API if <code>serializer_class</code> is used, even when <code>get_serializer</code> method does not exist on the view. (<a href="../../gh2743">#2743</a>)</li>