lib/securerandom.rb: improve docs
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63402 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
lib/securerandom.rb: improve docs
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63402 b2dd03c8-39d4-4d8f-98ff-823fe69b080e