Grainformat: remove extraneous newline for function comments in submodules

[alex-snezhko]

Formatting the following code

module Test

module Inner {
  /**
   * Do stuff
   */
  provide let fn = () => 1
}

Produces an extra newline after the function comment when it probably shouldn't

module Test

module Inner {
  /**
   * Do stuff
   */

  provide let fn = () => 1
}