Style Guide: Method Invocation is outdated

For example:
"""
Scala allows the omission of parentheses on methods of arity-0 (no arguments):
```scala
reply()
// is the same as
reply
```
"""
This is not allowed, at least in Scala 3:
https://scastie.scala-lang.org/8HKODlg1QXWvKbo0QfeLvw

There is also no mention of the `inline` keyword, which I believe to be now required for inline methods