ip help text should fit on 80 columns

Help text such as output by "ip help" or "ip link help" should fit
on 80 columns. It currently seems to take up to 86 columns.

Tested version:

zira:~> ip -V
ip utility, iproute2-5.9.0, libbpf 0.3.0

but that's the iproute2 5.10.0-4 Debian package.

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Vincent Lefèvre [off-list ref] - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)