It looks like the COPYING details for 9.0.0.0 didn't get updated for the switch to Ruby 2.2.

1. The COPYING file still references the ruby scripts from MRI for 1.8 and 1.9, which AFAICT are no longer present
2. Similarly, it does not mention the ruby scripts that are present (incl which version of MRI they're from)
3. LICENSE.RUBY appears to be the "Ruby License" associated with the MRI <= 1.9.2 (GPL or Matz conditions) As of MRI 1.9.3+, the "Ruby License" switched to be BSD-2-Clause or Matz conditions

Presuming the included stuff in lib/ruby/stdlib | lib/ruby/truffle/mri is from a 2.2.0+ version, could we update things appropriately?

Expanding the section to cover the other implementations unders lib/ruby/truffle would also make it easier for downstream users of jruby.