Remove MLS example from SELinux example in run reference

Automatic translation of MLS labels is currently not
supported, so should not be documented as an example.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

docs/reference/run.md

@@ -630,15 +630,12 @@ with the same logic -- if the original volume was specified with a name it will
 
 
 You can override the default labeling scheme for each container by specifying
-the `--security-opt` flag. For example, you can specify the MCS/MLS level, a
-requirement for MLS systems. Specifying the level in the following command
+the `--security-opt` flag. Specifying the level in the following command
 allows you to share the same content between containers.
 
     $ docker run --security-opt label=level:s0:c100,c200 -it fedora bash
 
-An MLS example might be:
-
-    $ docker run --security-opt label=level:TopSecret -it rhel7 bash
+> **Note**: Automatic translation of MLS labels is not currently supported.
 
 To disable the security labeling for this container versus running with the
 `--permissive` flag, use the following command: