dd: manpage does not detail bs vs. ibs/obs behaviour

[Pascal Bouchareine]

Hi,

I believe the following (from fileutils) could be re-added to dd's
manpage:

"(And setting bs is not equivalent with setting both ibs and obs to this
 same value, at least when no conversion other than sync, noerror and
 notrunc is specified, since it stipulates that each input block shall
 be copied to the output as a single block without aggregating short
 blocks.)"

Sorry if this had a reason to go away - I couldn't spot it.
Just checked this on coreutils 5.94

Thanks for your time,
Pascal