Correct typo in help message

Dependencies

• [2] AEPEFS7O Write help for each argument
• [3] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [4] 5HF7C67M push/pull: fixed "changes" arguments

Change contents

• replacement in pijul/src/commands/pushpull.rs at line 100
  [3.113832]→[2.2257:2312](∅→∅)
  − /// Download full changes, even when not necessory
  [3.113832]

  [2.2312]
  + /// Download full changes, even when not necessary