support to line break between commands

[gullitmiranda]

Currently, can't add empty lines between scope statement. This functionality provides better organization of Usage.txt.

Usage:
  azk agent (start|status|stop) [--no-daemon --child --no-reload-vm --configure-file=<file>] [-qh] [-l <level>] [-v]...
  azk config (track-toggle|track-status) [-qh] [-l <level>] [-v]...
  azk doctor [--logo] [-qh] [-l <level>] [-v]...
  azk docker [-qh] [-l <level>] [-v]... [-- <docker-args>...]
  azk info [--no-colored] [-qh] [-l <level>] [-v]...

  azk deploy (fast|slow|restart|ssh|versions) [-vh]
  azk deploy rollback [<git-ref>] [-vh]
  azk deploy [-vh]