[spp] [PATCH 4/5] docs: add exit description to spp_mirror usecase

[x-fn-spp at sl.ntt-tx.co.jp]

From: Hideyuki Yamashita <yamashita.hideyuki at po.ntt-tx.co.jp>

This patch adds exit description to usecase of spp_mirror.

Signed-off-by: Hideyuki Yamashita <yamashita.hideyuki at po.ntt-tx.co.jp>
Signed-off-by: Naoki Takada <takada.naoki at lab.ntt.co.jp>
---
 docs/guides/spp_vf/use_cases/usecase2.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/docs/guides/spp_vf/use_cases/usecase2.rst b/docs/guides/spp_vf/use_cases/usecase2.rst
index c7f62e4..2447cfa 100644
--- a/docs/guides/spp_vf/use_cases/usecase2.rst
+++ b/docs/guides/spp_vf/use_cases/usecase2.rst
@@ -268,3 +268,12 @@ Add port from classifier_mac1 to VM1.
 
     # Add port from classifier_mac1 to VM1.
     spp > vf 1; port add ring:0 rx forwarder1
+
+Exit spp_mirror
+~~~~~~~~~~~~~~~
+
+Terminate spp_mirror.
+
+.. code-block:: console
+
+    spp > mirror 1; exit
-- 
2.17.1