Removing internal references to the EXT constant. Additionally, marked the constant as deprecated. Use ".php" instead. Also adding upgrade notes from 2.0.2 to 2.0.3.
diff --git a/user_guide/installation/upgrading.html b/user_guide/installation/upgrading.html
index 1c4eb88..014ffa3 100644
--- a/user_guide/installation/upgrading.html
+++ b/user_guide/installation/upgrading.html
@@ -60,6 +60,7 @@
<p>Please read the upgrade notes corresponding to the version you are upgrading from.</p>
<ul>
+ <li><a href="upgrade_203.html">Upgrading from 2.0.2 to 2.0.3</a></li>
<li><a href="upgrade_202.html">Upgrading from 2.0.1 to 2.0.2</a></li>
<li><a href="upgrade_201.html">Upgrading from 2.0 to 2.0.1</a></li>
<li><a href="upgrade_200.html">Upgrading from 1.7.2 to 2.0</a></li>