knu c2e59df31b Remove Ns before puctuation
* man/erb.1, man/irb.1, man/ri.1, man/ruby.1: Remove Ns before
  puctuation.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56256 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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