Fix broken formatting in config-gerrit documentation

Change-Id: I00464ef8357f6e6afe468c731532e3712b9c3a96
diff --git a/Documentation/config-gerrit.txt b/Documentation/config-gerrit.txt
index d46d83e..4cb3aa1 100644
--- a/Documentation/config-gerrit.txt
+++ b/Documentation/config-gerrit.txt
@@ -1848,7 +1848,7 @@
 
 +
 By default, `SQL`.
-+
+
 After enabling the secondary index, the index must be built using
 the link:pgm-reindex.html[reindex program] before restarting the
 Gerrit server.