You can simply remove the doc directory in the RubyGems installation directory.
rm -r `gem env gemdir`/doc
On Mac OS X by default, it's /Library/Ruby/Gems/1.8/doc.
Keep in mind that there might be several installation directories for RubyGems.
- RubyGems will try to install to your user directory (something like
~/.gem/ruby/1.8/) if it can't access the normal installation directory (e.g. you installed a gem without sudo).
- RVM also installs RubyGems for each Ruby it installs which will contain a
doc directory containing rdoc and ri files (e.g. ~/.rvm/gems/ruby-1.9.2-preview1/doc).
This will merely remove existing files, but new ones will come with new installations anyway, unless you use the --no-document flag for gem install or make it a default.
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