[JENKINS-13378] Update changelog.html with fix.

changelog.html

@@ -55,6 +55,9 @@ Upcoming changes</a>
 <!-- Record your changes in the trunk here. -->
 <div id="trunk" style="display:none"><!--=TRUNK-BEGIN=-->
 <ul class=image>
+  <li class=bug>
+    Fixed: XML API Logs Too Much Information When Invalid Char is Present
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-13378">issue 13378</a>)
   <li class=bug>
     Fixed: tests with the same name are no longer counted correctly.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-13214">issue 13214</a>)