Fix docs build.

jpountz · jpountz · commit 1af6d20efe83 · 2018-06-05T14:55:40.000+02:00
diff --git a/docs/reference/query-dsl/query-string-syntax.asciidoc b/docs/reference/query-dsl/query-string-syntax.asciidoc
@@ -254,7 +254,6 @@ would look like this:
         }
     }
 
-****
 
 ===== Grouping
 
