Fixing the help message for apply

Dependencies

• [2] 62XVBWPY remove redundant Clap attributes
• [3] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [4] JWTT77WJ Add help on subcommands

Change contents

• replacement in pijul/src/main.rs at line 97
  [2.152]→[3.752:789](∅→∅),[3.85582]→[3.752:789](∅→∅)
  − /// Applies one channel to other
  [2.152]

  [3.85610]
  + /// Applies changes to a channel