I've seen Openfire is using package.html for documentation.
Since Java 5 package-info.java is the preferred approach for package documentation, though.
package-info.java - This file is generally preferred over package.html.
Replace package.html with package-info.java
Add package-info.java where it is missing.
There are still some packages without a package-info.java file. Because I don't know what these packages are for and it's probably not that important anyway, I am closing this issue.