Add missing docs for #8509

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

docs/sources/reference/api/docker_remote_api.md

@@ -53,6 +53,7 @@ You can still call an old version of the API using
 total memory available (`MemTotal`).
 
 `POST /containers/create`
+
 **New!**
 You can set the new container's MAC address explicitly.
 
@@ -62,6 +63,11 @@ You can set the new container's MAC address explicitly.
 Passing the container's `HostConfig` on start is now deprecated.  You should
 set this when creating the container.
 
+`POST /containers/(id)/copy`
+
+**New!**
+You can now copy data which is contained in a volume.
+
 ## v1.15
 
 ### Full Documentation