dm log userspace: fix comment hyphens

Fix comments: clustered-disk needs a hyphen not an underscore.

Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
diff --git a/Documentation/device-mapper/dm-log.txt b/Documentation/device-mapper/dm-log.txt
index 994dd75..c155ac5 100644
--- a/Documentation/device-mapper/dm-log.txt
+++ b/Documentation/device-mapper/dm-log.txt
@@ -48,7 +48,7 @@
 communication.
 
 There are currently two userspace log implementations that leverage this
-framework - "clustered_disk" and "clustered_core".  These implementations
+framework - "clustered-disk" and "clustered-core".  These implementations
 provide a cluster-coherent log for shared-storage.  Device-mapper mirroring
 can be used in a shared-storage environment when the cluster log implementations
 are employed.