mount_setattr.2: Remove description of propagation types

These types are already well described in mount_namespaces(7);
indeed, much of the text from that page seems to have just been
cut and pasted into this page! Simply referring the reader to
mount_namespaces(7) is sufficient.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/mount_setattr.2

@@ -374,35 +374,17 @@ the following values:
 .TP
 .B MS_PRIVATE
 Turn all mounts into private mounts.
-Mount and unmount events do not propagate into or out of this mount point.
 .TP
 .B MS_SHARED
 Turn all mounts into shared mounts.
-Mount points share events with members of a peer group.
-Mount and unmount events immediately under this mount point
-will propagate to the other mount points that are members of the peer group.
-Propagation here means that the same mount or unmount will automatically occur
-under all of the other mount points in the peer group.
-Conversely,
-mount and unmount events that take place under peer mount points
-will propagate to this mount point.
 .TP
 .B MS_SLAVE
 Turn all mounts into dependent mounts.
-Mount and unmount events propagate into this mount point
-from a shared peer group.
-Mount and unmount events under this mount point do not propagate to any peer.
 .TP
 .B MS_UNBINDABLE
-This is like a private mount,
-and in addition this mount can't be bind mounted.
-Attempts to bind mount this mount will fail.
-When a recursive bind mount is performed on a directory subtree,
-any bind mounts within the subtree are automatically pruned
-(i.e., not replicated)
-when replicating that subtree to produce the target subtree.
+Turn all mounts into unbindable mounts.
 .PP
-For further details on propagation types, see
+For further details on the above propagation types, see
 .BR mount_namespaces (7).
 .SH RETURN VALUE
 On success,