Fixed minor typos
Merge pull request #221 from bruston/docfix

Fixed minor typos
Updating documentation.
Merge branch 'master' of github.com:laravel/docs
Updating documentation.
Document cache sections.
Adding note to cache section docs.
Document the crypt cipher and mode settings.
Document renaming columns.
Cleaning up some documentation.
Document collection sortBy.
Fix dropColumns reference.
Document Closure support in queues.
Update queue documentation.