update doc

Docker-DCO-1.1-Signed-off-by: Victor Vieux <victor.vieux@docker.com> (github: vieux)

docs/sources/reference/api/docker_remote_api.rst

@@ -50,6 +50,7 @@ What's new
 
    **New!** You can now use the force parameter to force delete of an image, even if it's
    tagged in multiple repositories.
+   **New!** You can now use the noprune parameter to prevent the deletion of parent images
 
 .. http:delete:: /containers/(id)
 

docs/sources/reference/api/docker_remote_api_v1.10.rst

@@ -931,6 +931,7 @@ Remove an image
            ]
 
         :query force: 1/True/true or 0/False/false, default false
+        :query noprune: 1/True/true or 0/False/false, default false
         :statuscode 200: no error
         :statuscode 404: no such image
         :statuscode 409: conflict