[e] (0) The giant clean-up of 2013. Improved internal consistency, ad…

…justed section order to make more sense, started a move away from abusing title='' for cross-references, fixed minor typos, cleaned up some dangling TODOs, very minor typo fixes, dropped some obsolete comments, un-commented-out minor things that had previously been commented out for reasons that no longer apply, etc. No normative changes.

Affected topics: CSS, Canvas, DOM APIs, HTML, HTML Syntax and Parsing, Microdata, Offline Web Applications, Rendering, Security, Video Text Tracks, Video and Audio, WebSocket API, Workers

git-svn-id: http://svn.whatwg.org/webapps@8229 340c8d12-0b0e-0410-8428-c7bf67bfef74