doc: update documentation.markdown for io.js.
doc: update documentation.markdown for io.js.

PR-URL: https://github.com/iojs/io.js/pull/950
Reviewed-By: Jeremiah Senkpiel <f1782d15e31ad502ea2c097c21cc235811d0cb7c@rocketmail.com>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node