Add reference to rename endpoint in correct version & add to new

Docker-DCO-1.1-Signed-off-by: Jessica Frazelle <jess@docker.com> (github: jfrazelle)

docs/sources/reference/api/docker_remote_api_v1.15.md

@@ -647,27 +647,6 @@ Status Codes:
 -   **404** – no such container
 -   **500** – server error
 
-### Rename a container
-
-`POST /containers/(id)/rename/(new_name)`
-
-Rename the container `id` to a `new_name`
-
-**Example request**:
-
-        POST /containers/e90e34656806/rename/new_name HTTP/1.1
-
-**Example response**:
-
-        HTTP/1.1 204 No Content
-
-Status Codes:
-
--   **204** – no error
--   **404** – no such container
--   **409** - conflict name already assigned
--   **500** – server error
-
 ### Pause a container
 
 `POST /containers/(id)/pause`