bug#16206: 24.3; Incorrect unused variable byte-compiler warning in dotimes

[Juri Linkov]

>> -the return value (nil if RESULT is omitted).
>> +the return value (nil if RESULT is omitted).  Note that RESULT
>> +should not be used unless it makes use of VAR.
>
> I would drop the "unless it makes use of VAR".

But without that addition the sentence makes no sense when
the documentation describes the RESULT argument and then
at the end says that "RESULT should not be used".
And I have no better idea how to handle its obsolescence:
maybe just remove all mentions of RESULT from documentation?