COPYING tabs vs whitespaces

Hi,

I found that license file COPYING is different as compared with http://www.gnu.org/licenses/gpl-2.0.txt
If I pass over with Linus's preamble, change is only about whitespaces - tabs vs. space.
Probably it's minor non-essential change, but some projects do this change, so rather I ask about that.



Regards,
Petr