Worked on enhancing documentation for the bundle-config command in both the ruby/ruby and rubygems/rubygems repositories, focusing on clarifying the behavior of the 'only' option. Used Ruby and roff to update guides, specifying that gems without an explicit group are assigned to the default group when the 'only' flag is used. Provided practical examples and explicit notes to reduce user confusion and misconfiguration risks. Leveraged skills in Bundler and RubyGems to ensure consistent documentation standards across both projects, improving onboarding for new users and establishing clearer guidance for gem installation workflows within the Ruby ecosystem. No bugs were reported.