suggested updates to review process changes

Update of the formal review process pages to track current practice.

As discussed on the steering committee list.

In order to use html-tidy as required on the [website update page](http://www.boost.org/development/website_updating.html), I first ran the pages through using the suggested settings, then made my changes in a separate commit 578b12e.  So please review that commit (otherwise there is too much noise).