Avoid crashe for unknown HTML tags; avoid crash for non-existing documentation; fix signature for JShell variables Reviewed-by: rfield
Adding internal support to resolve {@inheritDoc} and format javadoc to plain text for use by jdk.jshell and jdk.scripting.nashorn.shell, enhancing Shift-<tab> documentation in JShell with ability to show javadoc. Reviewed-by: jjg, rfield