number fix

Author: rustagir

source/whats-new.txt

@@ -20,7 +20,7 @@ What's New
 Learn what's new in:
 
 * :ref:`Version 5.2 <java-version-5.2>`
-* :ref:`Version 5.1.2 <java-version-5.1.3>`
+* :ref:`Version 5.1.3 <java-version-5.1.3>`
 * :ref:`Version 5.1.2 <java-version-5.1.2>`
 * :ref:`Version 5.1.1 <java-version-5.1.1>`
 * :ref:`Version 5.1 <version-5.1>`