Update the docs around the built-in rubygems() repository proxy
Update the docs around the built-in rubygems() repository proxy

MisumiRize/jruby-gradle-plugin,MisumiRize/jruby-gradle-plugin,raelik/jruby-gradle-plugin,raelik/jruby-gradle-plugin,raelik/jruby-gradle-plugin,MisumiRize/jruby-gradle-plugin,jamescway/jruby-gradle-plugin,jamescway/jruby-gradle-plugin,jamescway/jruby-gradle-plugin