fix method name in documentation

Dependencies

• [2] N2NUGNN4 include a brief reference enabling many useful apps
• [3] H5UZI3YN editor documentation

Change contents

• replacement in reference.md at line 94
  [2.4583]→[2.4583:4655](∅→∅)
  − * `App.keyrelease(key)` -- called when you press a key on the keyboard.
  [2.4583]

  [2.4655]
  + * `App.keyreleased(key)` -- called when you press a key on the keyboard.