doc: fixed punctuation
doc: fixed punctuation

Period ending a sentence should be outside parens

PR-URL: https://github.com/iojs/io.js/pull/476
Reviewed-By: Rod Vagg <f9f03903429036ef609ed7ca822fddfa76155c29@vagg.org>

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