doc: remove extra indentation in iojs changelog · nodejs/node@fc11fe8

doc: remove extra indentation in iojs changelog

This removes the extra two spaces indentation which was somewhy present in the iojs changelog from v1.8.1 to v3.3.1. iojs changelog was the only file affected. PR-URL: #7727 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Michaël Zasso <mic.besace@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>

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