iproute2: Mention the 'up' argument in documentation

Both ip-link and ip-address support the 'up' argument, however this
isn't documented in neither their help outputs or ip-address' manpage.
This patch fixes that.

Signed-off-by: Petr Šabata <contyk@redhat.com>
Reported-by: Jiří Popelka <jpopelka@redhat.com>
3 files changed