[doc][patch] Write about binary numbers

[Ken Takata]

Hi,

Recently Vim supported binary numbers, but it was not written in usr_41.txt.
Please check the attached patch.

Regards,
Ken Takata

[Bram Moolenaar]

Ken Takata wrote:

> Recently Vim supported binary numbers, but it was not written in usr_41.txt.
> Please check the attached patch.

I'll include it, thanks!


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