This pull request consists of 2 commits, pick either/or/none at your pleasure. :)
The first contains an addition to the CHANGELOG for the addition of #beginning_of_hour and #end_of_hour core extensions as merged in #6156.
The second contains a consistency update for CHANGELOG entry indentation.
I will open up a second pull request for a similar change against 3-2-stable shortly.
Add CHANGELOG section for unreleased Rails 3.2.4; document addition o…
…f #beginning_of_hour and #end_of_hour to Time and DateTime core extensions.
Consistent CHANGELOG entry indentation.