api-ref: fix response code and data type for volume interfaces

1. https://developer.openstack.org/api-ref/block-storage/v3/?expanded=get-volumes-summary-detail#get-volumes-summary
total_count in "Get volumes summary" should be integer

2. https://developer.openstack.org/api-ref/block-storage/v3/index.html#create-metadata-for-volume
Response code for "Create metadata for volume" interface should be 200.

Change-Id: If278e939a9a580329e24709877c13ed4e70d6180

api-ref/source/v2/volumes-v2-volumes.inc

@@ -495,7 +495,7 @@ Response codes
 
 .. rest_status_code:: success ../status.yaml
 
-   - 202
+   - 200
 
 
 Request

api-ref/source/v3/parameters.yaml

@@ -2792,6 +2792,12 @@ total_count:
   in: body
   required: true
   type: string
+total_count_int:
+  description: |
+    Total number of volumes.
+  in: body
+  required: true
+  type: integer
 total_size:
   description: |
     Total size of volumes in GB.

api-ref/source/v3/volumes-v3-volumes.inc

@@ -516,7 +516,7 @@ Response codes
 
 .. rest_status_code:: success ../status.yaml
 
-   - 202
+   - 200
 
 
 Request
@@ -785,7 +785,7 @@ Response Parameters
 
    - volume-summary: volume-summary
    - total_size: total_size
-   - total_count: total_count
+   - total_count: total_count_int
    - metadata: summary_metadata