Update "man" of docker-run

Signed-off-by: mapk0y <mapk0y@gmail.com>

man/docker-run.1.md

@@ -233,8 +233,7 @@ to the quota you specify.
 
    At any time you can run **docker ps** in
 the other shell to view a list of the running containers. You can reattach to a
-detached container with **docker attach**. If you choose to run a container in
-the detached mode, then you cannot use the **-rm** option.
+detached container with **docker attach**.
 
    When attached in the tty mode, you can detach from the container (and leave it
 running) using a configurable key sequence. The default sequence is `CTRL-p CTRL-q`.