[dpdk-stable] [PATCH] doc: fix typo in ipsec-secgw guide

[Akhil Goyal]

> Fixes: 02dc5b7d58c7 ("doc: update ipsec-secgw guide and release notes")
> Cc: stable at dpdk.org
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> ---
Applied to dpdk-next-crypto

Thanks.