better comment

Dependencies

• [2] WZZGVKSG a few more renames
• [3] 5OVKHVY6 nice way to make on.* handlers more discoverable
• [4] 2A3F3YUS clarify on.code_change
• [5] NVVHJWJE a new event: receiving code changes from the driver

Change contents

• replacement in 0001-on at line 11
  [3.296]→[2.328:348](∅→∅)
  − -- on.file_drop
  [3.296]

  [3.318]
  + -- on.file_drop (see love.filedropped)