doc: add missing empty value for `kdb set`
@@ -32,7 +32,7 @@ if is_plugin_available dump && is_plugin_available list && is_plugin_available s
[ $? != 0 ]
succeed_if "getting cascading should fail if nothing is there"
- "$KDB" set spec:$ROOT_MOUNTPOINT/test > /dev/null
+ "$KDB" set spec:$ROOT_MOUNTPOINT/test "" > /dev/null
succeed_if "could not create key"
"$KDB" get $ROOT_MOUNTPOINT
