Inline comments for params of methods/classes

[BarkingBad]

@julienrf proposed to have inline comments for params of methods/classes in #10526

What do you think of documenting parameters directly, rather than in the scaladoc comment attached to their method/class definition?
E.g.:

/** A Foo */
case class Foo(
  /** An x */
  x: Int
)

def bar(
  /** A Bah */
  bah: Bah
)(using
  /** Context Quux */
  Quux
): Unit

I think this would be useful outside of using parameters, by the way.

We could reconsider it in the future