Improve the 3.6 about page "Under the Hood" copy.

Props markjaquith, aaroncampbell. See #24832 for trunk.

git-svn-id: http://core.svn.wordpress.org/trunk@24888 1a063a9b-81f0-0310-95a4-ce76da25c4cd
WP_HTTP: PHPDoc updates for WP_Http::handle_redirects(). Props DrewAPicture. Fixes #16889


git-svn-id: http://core.svn.wordpress.org/trunk@24890 1a063a9b-81f0-0310-95a4-ce76da25c4cd