Scaladoc drops implicit modifier

In the docs at http://dotty.epfl.ch/api/scala/collection/StringOps.html labeled 3.0.1-RC1-bin-20210416-8086e4b-NIGHTLY, the `implicit` parameters of the methods `sortBy`, `sorted`, and `toArray` are not labeled `implicit`. For example,

```
def sortBy[B](f: Char => B)(ord: Ordering[B]): String
```
## Expectation

The implicit parameter should be marked as `implicit` (or perhaps `using`?)
