Documentation for Ruby

Ruby master Ruby 3.3 Ruby 3.2 Ruby 3.1 Ruby 3.0 Ruby 2.7.0 Ruby 2.6.0 (outdated) Ruby 2.5.0 (outdated) Ruby 2.4.0 (outdated) Ruby 2.3.0 (outdated) Ruby 2.2.0 (outdated) Ruby 2.1.0 (outdated) Ruby 2.0.0 (outdated)