docs: correct deleting an interface ip address

docs: correct deleting an interface ip address

The del keyword must be specified after ip address, not at the end
as the example shows.

DBGvpp# sh int addr
sh int addr
enp134s0f0np0/0 (up):
  L3 10.10.10.32/24
local0 (dn):
DBGvpp#  set interface ip address enp134s0f0np0/0 10.10.10.32/24 del
 set interface ip address enp134s0f0np0/0 10.10.10.32/24 del
set interface ip address: failed to add 10.10.10.32/24 on enp134s0f0np0/0 which conflicts with 10.10.10.32/24 for interface enp134s0f0np0/0
DBGvpp# sh int addr
sh int addr
enp134s0f0np0/0 (up):
  L3 10.10.10.32/24
local0 (dn):
DBGvpp#  set interface ip address del enp134s0f0np0/0 10.10.10.32/24
 set interface ip address del enp134s0f0np0/0 10.10.10.32/24
DBGvpp# sh int addr
sh int addr
enp134s0f0np0/0 (up):
local0 (dn):
DBGvpp#

Type: fix

Change-Id: Icd85cbbc5b149c67d411f837f0cd9b76beddc5b6
Signed-off-by: Steven Luong <[email protected]>