doc: fix typo miliseconds -> milliseconds
doc: fix typo miliseconds -> milliseconds

PR-URL: https://github.com/iojs/io.js/pull/865
Reviewed-By: Colin Ihrig <838f779c91673db29b8572ea3f54d191d3878ae2@gmail.com>

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