[rest] Include Resource name in @doc when using TypeSpec.Rest.Resource.ResourceOperations

[thegagne]

Clear and concise description of the problem

I noticed in the playground using the REST Framework that the descriptions are not Resource specific.

For example:

      description: Lists all instances of the resource.

When I would expect that it would say:

      description: Lists all instances of Widget.

After some digging, I found out that you can pass in the Resource into @doc to provide this functionality:

  @doc("Lists all instances of {name}.", Resource)

But the REST Framework has not implemented this.

Checklist

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.