[spp] [PATCH 2/5] docs: add spp_mirror exit to reference

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

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

This patch adds exit command for spp_mirror to command reference.

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/commands/secondary/spp_mirror.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/docs/guides/commands/secondary/spp_mirror.rst b/docs/guides/commands/secondary/spp_mirror.rst
index 7aab9d1..de20c1a 100644
--- a/docs/guides/commands/secondary/spp_mirror.rst
+++ b/docs/guides/commands/secondary/spp_mirror.rst
@@ -218,3 +218,12 @@ Here is an example.
 
     # delete tx port 'vhost:1' from 'mr1'
     spp > mirror 2; port del vhost:1 tx mr1
+
+exit
+----
+
+Terminate the spp_mirror.
+
+.. code-block:: console
+
+    spp > mirror 2; exit
-- 
2.17.1