More in depth documentation about specific fields in the server macro

## Feature Request

The inline documentation for the server macro includes a list of attributes you can pass to the macro, but the descriptions of each argument don't make it clear what values you are able to pass into the macro. For example the `input` argument only accepts types that implement the codec traits for encoding and decoding the type from a request and response

## Implement Suggestion

The argument documentation should be expanded with more details about argument types and examples of different values for each argument