clarify something in the docs

Dependencies

• [2] YCYCQOFC bugfix: on.load_settings when there are none
• [*] 5OVKHVY6 nice way to make on.* handlers more discoverable
• [*] FRXBX5FC create space for app-specific settings

Change contents

• edit in 0001-on at line 21
  [2.233]

  [5.227]
  + -- runs before on.initialize
• edit in 0001-on at line 23
  [5.328]

  [4.557]
  + -- runs after on.quit