man if_bridge need an improvement

[Nikolay Pavlov]

Hi, folks.

I think that if_bridge(4) man need a additional note. Something like:

If you are using interface as a bridge member without any ip address
assigned, you need to enable it via "ifconfig interface up" command.
Or you can add "ifconfig_interface="up"" to your /etc/rc.conf.

It's very hard to figure it out when you configure bridge for the first
time. Should i submit a PR or forward this to doc?
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= Best regards, Nikolay Pavlov. <<<--------------------------------------- =
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