doc(inline): improve recursive example

[robstoll]

Either my assumption about by-name parameters in the context of inline functions is wrong, i.e. they are not lazily evaluated or the example was wrong.
I have changed the example. Its more complicated but hopefully the difference between inline and by-name is more obvious this way.

I have put inline def on a new line as there was no space, it looks as follows on the website inline def.inline

[nicolasstucki]

By-name arguments are evaluated on each reference

def f(a: =>Unit): Unit = {
  a
  a
  a
}
f { println("hello") }

prints

hello
hello
hello

[robstoll]

Oh man 🤕 seems like I always made a wrong assumption about by-name parameters. Although https://docs.scala-lang.org/tour/by-name-parameters.html states it quite clearly.
I have taken your example but put an emphasise on the fact that inline just inlines and thus can make the code bigger (but on the other hand allows for constant folding)

[nicolasstucki]

Don't worry about it. Most use cases of by-name parameters use it 0 or 1 times, in which case it is semantically equivalent to lazy val but more performant.