Ruby

Recently an improvement was made to the documentation adding some new files.

I was reading doc/contributing/building_ruby.md where explains how to debug the source code.

It is mentioning about make lldb-runruby and make gdb-runruby, these are rules that I do not think they exist.

I can execute make lldb-ruby and make gdb-ruby in the other hand.

Patch https://github.com/ruby/ruby/pull/5908.