Adress some typo for multi-instance-create api-ref

Some syntax mistakes and typo in api-ref, rename 'server' to instance
and so on

Change-Id: I5f4b38658a17fd62531beac493a8d068a708087e

api-ref/source/v1/instances.inc

@@ -81,7 +81,7 @@ There is a second kind of create call which can create multiple instances
 at once. This supports all the same parameters as create with a few additional
 attributes specific to multiple create.
 
-Error handling for multiple create is not as consistent as for single server
+Error handling for multiple create is not as consistent as for single instance
 create, and there is no guarantee that all the instances will be created
 successfully.
 
@@ -98,8 +98,8 @@ These are the parameters beyond single create that are supported.
 .. rest_parameters:: parameters.yaml
 
   - name: multi_instacne_name_body
-  - min_count(Optional): min_count_body
-  - max_count(Optional): max_count_body
+  - min_count: min_count_body
+  - max_count: max_count_body
 
 **Example Create Multiple Instance: JSON request**
 
@@ -109,7 +109,7 @@ These are the parameters beyond single create that are supported.
 Response
 --------
 
-The first instace will be returned. The returned paramaters is same to creating
+The first instance will be returned. The returned paramaters is same to creating
 a single instance's.
 
 **Example Create Multiple Instance: JSON response**

api-ref/source/v1/parameters.yaml

@@ -192,13 +192,13 @@ lock_state:
   type: boolean
 max_count_body:
   description: |
-      The max number of servers to be created. Defaults to the value of ``min_count``.
+      The max number of instances to be created. Defaults to the value of ``min_count``.
   in: body
   required: false
   type: integer
 min_count_body:
   description: |
-    The min number of servers to be created. Defaults to 1.
+    The min number of instances to be created. Defaults to 1.
   in: body
   required: false
   type: integer