Minor fixes to example docs

[bostonaholic]

A couple of minor mistakes I found in the docs when working through an implementation of dynamic sub resources.

1. ActiveSupport::CurrentAttributes is the correct class docs [code]
2. sub_resourece_name was assigned but then name was shoveled incorrectly [code]
3. Using attribute :name will result in infinite recursion, presumably due to it trying to override the .name class method [code]

[atraver-shopify]

Thanks for keeping things tidy! Just a minor typo on the variable name.

[bostonaholic]

/shipit

oops, habit

[pjambet]

Missed this, but thanks for the fix!