doc: remove non-standard use of hyphens

Identifies the non-idiomatic usages of the '-' character
and either removes them or replaces them with colons.

Fixes: https://github.com/nodejs/node/issues/5672
R-URL: https://github.com/nodejs/node/pull/5677


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Claudio Rodriguez <cjrodr@yahoo.com>