adjust comment

Author: vladak

opengrok-web/src/main/java/org/opengrok/web/PageConfig.java

@@ -1851,7 +1851,7 @@ public boolean isNotModified(HttpServletRequest request, HttpServletResponse res
                         getProjectMessages(),
                         // last timestamp value
                         getEnv().getDateForLastIndexRun() != null ? getEnv().getDateForLastIndexRun().getTime() : 0,
-                        // OpenGrok version has changed since the last time
+                        // OpenGrok version
                         Info.getVersion()
                 )
         );