[Bug]: getStatusCodeDescription limits doc decorator defined in models of type Response

### Describe the bug

As of recently it seems like the doc decorator in models of type Response is ignored and the descriptions set in the rangeDescription function are forced based on the status code. Is it possible to reset this so that the doc decorator overrides the default responses?


### Reproduction

The following typespec example:

```typespec
@error
model Error {
@doc("Error code")
code: string;
@doc("Error description")
description: string;
}

@doc("Method not allowed")
model MethodNotAllowedResponseis Response<405>;

alias ErrorType = (MethodNotAllowedResponse & Error);

@route("/sample")
interface SamplesInterface {
@get list(): SampleList | ErrorType;
```

generates the following:

```yaml
.....
responses:
'200':
description: The request has succeeded.
content:
application/json:
schema:
$ref: '#/components/schemas/SampleList'
'405':
description: Client error
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
......
```

instead of

```yaml
......
responses:
'200':
description: The request has succeeded.
content:
application/json:
schema:
$ref: '#/components/schemas/SampleList'
'405':
description: Method not allowed
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
.......
```

### Checklist

- [x] Follow our [Code of Conduct](https://github.com/microsoft/typespec/blob/main/CODE_OF_CONDUCT.md)
- [x] Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
- [x] Check that this is a concrete bug. For Q&A open a [GitHub Discussion](https://github.com/Microsoft/typespec/discussions).
- [x] The provided reproduction is a [minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example) of the bug.