net: fix new kernel-doc warnings in net core

Fix new kernel-doc warnings in net/core/dev.c:

Warning(net/core/dev.c:4788): No description found for parameter 'new_carrier'
Warning(net/core/dev.c:4788): Excess function parameter 'new_carries' description in 'dev_change_carrier'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>