stringio.c: Fix an example doc [ci skip]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51218 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
stringio.c: Fix an example doc [ci skip]
StringIO#puts should be set "\n" at last. [Fix GH-965]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51218 b2dd03c8-39d4-4d8f-98ff-823fe69b080e