bug#45258: mkdir man page unclear in describing -m flag

[Pádraig Brady]

On 15/12/2020 20:00, Paul Eggert wrote:
> Thanks for your bug report. I installed the attached patch; although it
> doesn't use the exact wording you proposed, I hope it works well enough.

I agree with adding the clarification to the man page,
thanks for doing that.

I also added an entry to:
http://www.pixelbeat.org/docs/coreutils-gotchas.html#mkdir

cheers,
Pádraig