iproute2: bridge: finish removing replace option in man pages

iproute2: bridge: finish removing replace option in man pages

This patch finishes removing the replace option from the bridge
man page which I missed in this commit

commit 57b9785de32404da3d2ac5483469b7fcc5a9c9e7
Author: John Fastabend <john.r.fastabend@intel.com>
Date:   Mon Aug 27 10:52:31 2012 -0700

    iproute2: bridge: remove replace and change options

Also add documentation for "{ self | embedded }" already shown on
the cmd line help msg.

Signed-off-by: John Fastabend <john.r.fastabend@intel.com>