api-ref: Fix wrong HTTP response codes

* POST /servers

  The 413 response code has not been expected
  since I470b53af45ff47c1dec98d09d7a426a29ca1efc6.
  So remove 413.

* POST /server/{server_id}/action

  In 'Rebuild' action, the 413 response code has not been expected
  since I470b53af45ff47c1dec98d09d7a426a29ca1efc6.
  So remove 413.

  In 'Rescue' action, the normal response code is actually 200
  instead of 202.
  So fix it.

Change-Id: I6e91d3ac751777f48ab084395a66cb3f83bfcca2
Implements: blueprint api-ref-in-rst-pike
Closes-Bug: #1677452

api-ref/source/servers-actions.inc

@@ -398,7 +398,7 @@ set the ``preserve_ephemeral`` parameter to ``true``.
 Normal response codes: 202
 
 Error response codes: badRequest(400),unauthorized(401), forbidden(403),
-itemNotFound(404), conflict(409), payloadTooLarge(413)
+itemNotFound(404), conflict(409)
 
 Request
 -------
@@ -521,7 +521,7 @@ reference, the base image reference is used by default.
 After you successfully rescue a server and make a ``GET
 /servers/​{server_id}​`` request, its status changes to ``RESCUE``.
 
-Normal response codes: 202
+Normal response codes: 200
 
 Error response codes: badRequest(400), unauthorized(401), forbidden(403),
 itemNotFound(404), conflict(409), notImplemented(501)

api-ref/source/servers.inc

@@ -280,7 +280,7 @@ request.
 Normal response codes: 202
 
 Error response codes: badRequest(400), unauthorized(401),
-forbidden(403), itemNotFound(404), conflict(409), entityTooLarge(413)
+forbidden(403), itemNotFound(404), conflict(409)
 
 ..
   TODO(sdague): leave these notes for later when fixing the body