Add description and examples for the name parameter accepts a url or a l...

...ocal path to a rpm file.

I send this pull request in response to
https://groups.google.com/d/msg/ansible-project/qkDKEUb2Dws/Vyt98B3nfIcJ

I'm not sure my English in the description makes sense to native speakers.
Could you edit it appropriately?
Thanks!