In case https://www.rubydoc.info/ Show archive.org snapshot is to slow or offline, you can also read a gem documentation offline.

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Start a server with gem server and go to http://0.0.0.0:8808/. Here you will find a list of all installed gems and it is possible to navigate to the documentation if installed e.g. http://0.0.0.0:8808/doc_root/rubocop-0.77.0/

In case you set the configured RubyGems to not install documentation by default, you need to add generate the documentation for the specific gem.

gem install rubocop --document

Known errors

undefined method `path=' for #<WEBrick::HTTPRequest:0x000055eb55fbff90>

Upgrade Show archive.org snapshot RDoc with gem update rdoc.