pijul reset: fixed help message

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 98
  [2.100]→[3.619:670](∅→∅),[3.85332]→[3.619:670](∅→∅)
  − /// Reverts the working copy to the given Hash
  [2.100]

  [3.85360]
  + /// Resets the working copy to the last recorded change.

  + ///

  + /// In other words, discards all unrecorded changes.