doc: minor additional corrections and improvements

Per feedback from @thefourtheye: (a) improve word on the
description of the `close` event in stream.markdown and
(b) remove `[module section]: modules.html` from
globals.markdown

Reviewed By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/2378