[ruby/stringio] Fixed a typo
https://github.com/ruby/stringio/commit/b249631c433f800c979be2705bf63555075db2fc#commitcomment-34804150
https://github.com/ruby/stringio/commit/998d6257fb
[ruby/stringio] Fixed a typo
https://github.com/ruby/stringio/commit/b249631c433f800c979be2705bf63555075db2fc#commitcomment-34804150
https://github.com/ruby/stringio/commit/998d6257fb