Fix the asciidoc syntax (#1780)

Author: NataliaIvakina

modules/ROOT/pages/clustering/setup/discovery.adoc

@@ -411,6 +411,7 @@ CALL dbms.cluster.showParallelDiscoveryState();
 | "V2_ONLY" | "N/A"           | "N/A"         | "3"           |
 +-------------------------------------------------------------+
 ----
+
 [[discovery-v1-to-v2-procedures]]
 === Using procedures