JDK-8373922 introduces a new default method to interface `jdk.javadoc.doclet.Taglet` that makes it easier to build relative URLs to other documentation resources. There are three JDK build Taglets that can make use uf this new feature: JSpec.java, ToolGuide.java and SealedGraph.java.

For JSpec and ToolGuide, the change consists in undoing the changes in JDK-8373909 and replacing it with the new way to create relative URLs.

For the SealedGraph taglet, the change is a bit more involved as we have to change the directory structure/naming convention for SVG graphs for nested classes in order to be able to make use of the new feature.