Document the fix

Author: NikEfth

documentation/release_6.4.htm

@@ -58,6 +58,11 @@ <h4>Changes to examples</h4>
 
   <h3>Bug fixes</h3>
   <ul>
+      <li>
+    Fixed a memory leak caused multiple calls to ProjDataInfo::clone() combined with dynamic_cast. 
+    The object is now cloned once and owndership is transferred safely after type checking.
+       </li>
+    <br>
   </ul>
 
   <h3>Build system</h3>