Listening to a few developers today discussing their troubles in understanding how to use the asset pipeline, it turns out that the precompile examples in the guides and assets.rb template have over time become a bit inconsistent.
This PR makes the examples consistent in code style, spacing, and asset names, removes the old 'swfObject.js' example, and in a couple of places wraps lines at 80 characters including in the assets.rb template.
Re-add spaces inside array parentheses.
As discussed with @fxn the release notes are a snapshot document.
The links going out to the API should represent that exact snapshot.
This means we always link to the full final release. For example
the 3.2 release notes link to http://api.rubyonrails.org/v3.2.0.
