Fix instances of "Warden’s" which should be "Wardens’"

lib/convert-worker.js

@@ -395,6 +395,9 @@ function fixPossessives(xml) {
   xml = xml.replace(/([^‘])Ms. Stillons’([^s])/g, "$1Ms. Stillons’s$2");
   xml = xml.replace(/([^‘])Chuckles’([^s])/g, "$1Chuckles’s$2");
 
+  // This one is not just missing the extra "s"; it's often misplaced.
+  xml = xml.replace(/Warden’s/g, "Wardens’");
+
   return xml;
 }