Rather than try to exclude layers in the touch hit test, this
specifically only checks against the main layer for the user dot or
puck.
Back-port of e4a9173a2a5c585dda3fa7a0f955cff1552f8d25.
- Makes the use of apostrophes in the iOS SDK documentation consistent by converting “dumb” `'` into smart `’`.
- Adds ticks around class/property names/values.
- Breaks lines at 80 characters.
