SIP-XX: Dedented Multiline String Literals

Why everybody wants some hard to reason about auto-margin-stripping?

Maybe there is a simpler way, for example to use prefix """ (with space after quotes) to set the start of line, like:

val multiLineText = 
  """ This is the first line.
  """ Second line works fine too
  """    Third line deserves 3 extra leading spaces.
  """ We can use even special substrings without escaping, like """!!!
  """ 
  """ Blank lines are OK too.
//  """ This line is commented out! Normal commenting works!
  """ Best part - there is no need to calculate how many leading spaces have to be stripped!
  """ Though block comments like `/*` would not work an - it is part of `multiText` value.
  s""" Sadly, marking line for interpolation breaks the nice alignment a bit, unless use marks all lines with `s""" ` prefix :) 

This is very similar to JEP 467: Markdown Documentation Comments.
Similar proposal (by me) for ScalaDocs: Support /// as ScalaDoc indicator same as in https://openjdk.org/jeps/467.