[m-rev.] diff: delete XXX from std_util interface

[Julien Fischer]

On Mon, 29 Dec 2014, Zoltan Somogyi wrote:

>
>
> On Mon, 29 Dec 2014 15:32:42 +1100 (AEDT), Julien Fischer
>> library/std_util.m:
>>  	Delete an XXX comment regarding alternative syntax for
>>  	compose/3 from the interface to this module -- it shows
>>  	up in the library reference manual otherwise.
>
> If you replaced the XXX with NOTE_TO_IMPLEMENTORS,
> it wouldn't. I recently added a filter for this to doc/Mmakefile.

True, but unless you are seriously suggesting we might want to one day
introduce a function with one letter name then I think it's probably
simpler to delete it.

Cheers,
Julien.