While this is technically correct, for the sake of consistency I'd like this to be something like "The credentials to attach to the request"

Here's an example from another PR, to contrast:

```
/// <typeparam name="T">The type to map the response to</typeparam>
/// <param name="uri">URI endpoint to send request to</param>
/// <param name="body">The object to serialize as the body of the request</param>
/// <param name="twoFactorAuthenticationCode">Two factory authentication code to use</param>
```