IB/ipoib: Remove broken link from Kconfig and documentation
Or Gerlitz authored

Remove references to the IPoIB IETF working group as it has been closed.
Signed-off-by: default avatarOr Gerlitz <ogerlitz@voltaire.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
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