[spp] [PATCH 4/5] docs: add DELETE method for exiting spp_primary

[ogawa.yasufumi@lab.ntt.co.jp]

From: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>

To support `bye` command of `spp.py`, add DELETE method for
spp_primary.

  $ curl -X DELETE http://127.0.0.1:7777/v1/primary

Signed-off-by: Yasufumi Ogawa <ogawa.yasufumi@lab.ntt.co.jp>
---
 docs/guides/spp-ctl/api-reference.rst | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/docs/guides/spp-ctl/api-reference.rst b/docs/guides/spp-ctl/api-reference.rst
index f0661c8..3c22cb9 100644
--- a/docs/guides/spp-ctl/api-reference.rst
+++ b/docs/guides/spp-ctl/api-reference.rst
@@ -253,7 +253,27 @@ Request example
 Response
 ^^^^^^^^
 
-There is no body content for the response of a successful ``PUT`` request.
+There is no body content for the response of a successful ``DELETE`` request.
+
+DELETE /v1/primary
+~~~~~~~~~~~~~~~~~~
+
+Terminate primary process.
+
+* Normal response codes: 204
+
+Request example
+^^^^^^^^^^^^^^^
+
+.. code-block:: console
+
+    curl -X DELETE -H 'application/json' \
+    http://127.0.0.1:7777/v1/primary
+
+Response
+^^^^^^^^
+
+There is no body content for the response of a successful ``DELETE`` request.
 
 
 API for spp_nfv/spp_vm
-- 
2.7.4