rustfmt removes comments from visibility annotation

Noticed a few times

```diff
-pub(crate /* important comment */) fn add(left: u64, right: u64) -> u64 {
+pub(crate) fn add(left: u64, right: u64) -> u64 {
     left + right
 }
```

There seem to be a lot of issues related to comments but I couldn't find this specific one after some basic searching.