Tell students what the Rails app should look like
Capitalize Rails
Remove extra link to Rails Architecture page.

This read as if people MUST go on to the Rails Architecture page, but it's very
much optional.
Explain what's in the migration file

This explanation is taken word-for-word from the main Railsbridge documentation.
Capitalize Rails
Minor formatting on CRUD with Scaffolding page

Double quotes, capitalization, etc.