what are the correct high/low maximums for _delay_ms()/_delay_us()

[Britton Kerin]

I guess the high-res maximums are 262.14 ms / F_CPU in MH for
_delay_ms() and 768 us / F_CPU in MHz for _dalay_us() regardless of
the availability of __builtin_avr_delay_cycles(), but
the way the _delay_ms() and _delay_us() descriptions are written this
is not entirely clear.  Am I correct?

If so, I'd suggest rewriting the descriptions for those functions to
not re-use the term "maximal possible delay".  Instead they could say
something like "maximum possible high-resolution delay"
and "maximum possible low-resolution delay".

Britton