Convert types in the documentation

[Example](https://github.com/dotnet/runtime/blob/688beda0d9943935cd8ff4735d488d2658baa3eb/src/libraries/System.Linq.AsyncEnumerable/src/System/Linq/Where.cs#L15C34-L15C81):

```cs
/// <param name="enumerable">An <see cref="IAsyncEnumerable{T}"/> to filter.</param>
```
