[whatwg/url] Is userinfo in URL deprecated? (#540)

Sorry if this question is already answered, I searched in the standard and I could find the answer.

In the [`authority state`](https://url.spec.whatwg.org/#authority-state) it says the following:
```
1. If c is U+0040 (@), then:

    1. Validation error.
    ...
```
Why does the `@` symbol in `authority` produce a validation error? Since it is not a failure, the only interpretation I can think of is that it is deprecated. But I did not find in the standard anything that says it's deprecated.

Am I correct?



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