remove line in jetty docs about JDK9 and HTTP2 (#2230)
remove line in jetty docs about JDK9 and HTTP2 (#2230)

Signed-off-by: Lachlan Roberts <f5e96ceb240f4c6b121fe0445b266d7666b5fe0e@webtide.com>
infosiftr/docker-library-docs,docker-library/docs,docker-library/docs,infosiftr/docker-library-docs