Provider reference location link is not working in example file

Hello!

While going trough the README for the in-network-rates schema, I have noticed that the file referenced by the following line does not contain a valid link to a provider-reference object:

price-transparency-guide/schemas/in-network-rates/README.md

Line 89 in 2a7d7af

    
           | **location** | Location | String  | A fully qualified domain name on where the provider group data can be downloaded. The file must validate against the requirements found in the [provider reference](https://github.com/CMSgov/price-transparency-guide/tree/master/examples/provider-reference). Examples can be found [here](https://github.com/CMSgov/price-transparency-guide/blob/574caa73dd0a1f49c7b4696f585dc6f8b087d67a/examples/in-network-rates/in-network-rates-fee-for-service-single-plan-sample.json#L25-L28) that would link to a valid provider reference file such as one found [here](https://github.com/CMSgov/price-transparency-guide/blob/master/examples/provider-reference/provider-reference.json). | No |

Here is the line of the file where the link does not work:

price-transparency-guide/examples/in-network-rates/in-network-rates-fee-for-service-single-plan-sample.json

Line 27 in 574caa7

"location": "https://www.cms.gov/some_provider_group.json"

In the case this is the expected outcome, please close this issue, however, in case this link is supposed to point to a valid provider-reference file, then the raw version of the example in the README could be a candidate: https://raw.githubusercontent.com/CMSgov/price-transparency-guide/master/examples/provider-reference/provider-reference.json

In case, here is a personal branch were I have made the changes (https://github.com/guido-muscioni-anthem/price-transparency-guide/blob/fix/location-in-provider-references-example-file/examples/in-network-rates/in-network-rates-fee-for-service-single-plan-sample.json), and I can submit a PR to develop.

Thank you!

@guido-muscioni-anthem The example in sample file was just meant to be an example, not actually link to a real external provider group url.