locking: Fix documentation on how automatic sanlock leases are stored

s/MD5 checkout/MD5 hash/

src/locking/sanlock.conf

@@ -18,7 +18,7 @@
 # The default location in which lockspaces are created when
 # automatic lease creation is enabled. For each unique disk
 # path, a file $LEASE_DIR/NNNNNNNNNNNNNN will be created
-# where 'NNNNNNNNNNNNNN' is the MD5 checkout of the disk path.
+# where 'NNNNNNNNNNNNNN' is the MD5 hash of the disk path.
 #
 # If this directory is on local storage, it will only protect
 # against a VM being started twice on the same host, or two