Fix error in api-ref about host

This patch adds the missing parameter "host_list" in api-ref.

Change-Id: I9dab7333b386675a2d9ae80c17f21e1f970a28c2
Closes-Bug: #1712466

api-ref/source/hosts.inc

@@ -31,12 +31,6 @@ Response Parameters
 
    - X-Openstack-Request-Id: request_id
    - hosts: host_list
-   - uuid: uuid
-   - hostname: hostname
-   - mem_total: mem_total
-   - cpus: cpus
-   - os: os
-   - labels: labels
 
 Response Example
 ----------------

api-ref/source/parameters.yaml

@@ -101,6 +101,19 @@ host:
   in: body
   required: true
   type: string
+host_ident:
+  description: |
+    The UUID or name of host in Zun.
+  in: body
+  required: true
+  type: string
+host_list:
+  description: |
+    The host information list, including hostname, uuid, links, labels,
+    cpus, mem_total and os.
+  in: body
+  required: true
+  type: array
 hostname:
   description: |
     The host where container is running.