[AD] documenting minor return values

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Some return values are undocumented, or left undefined purposely.

A few I've found are:

`install_timer' - pretty much assumed to work everywhere.

`install_keyboard' - only documented in source. Usually assumed to work.

`poll_mouse'
`poll_keyboard'
`poll_joystick' - usually assumed to work

`enable_triple_buffer' - `ex3buf.c' and `exupdate.c' use
`gfx_capabilities' instead of checking the return value

I've gone ahead and documented the return values of
`request_scroll' and `request_video_bitmap'.



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