Correct wording for action of a server

it's 'server action,' and not 'action and server.'

Change-Id: I138be600f317afb1ce3ac116e83b5a48d11cf6aa
Partial-Bug: #1515222

api-ref/src/wadls/compute-api/src/v2.1/wadl/os-instance-actions-v2.1.wadl

@@ -39,7 +39,7 @@
         <wadl:doc xml:lang="EN" title="Show server action details"
             xmlns="http://docbook.org/ns/docbook">
             <para role="shortdesc">
-                Shows details for an action and server.
+                Shows details for a server action.
             </para>
         </wadl:doc>
         <response status="200">
@@ -48,7 +48,8 @@
                     <xsdxt:code
                         href="../samples/os-instance-actions/instance-action-show-response.json"
                     />
-                </wadl:doc> &x-openstack-request-idHeader;
+                </wadl:doc>
+                &x-openstack-request-idHeader;
             </representation>
         </response>
     </method>
@@ -65,7 +66,8 @@
                     <xsdxt:code
                         href="../samples/os-instance-actions/instance-actions-list-response.json"
                     />
-                </wadl:doc> &x-openstack-request-idHeader;
+                </wadl:doc>
+                &x-openstack-request-idHeader;
             </representation>
         </response>
     </method>