Put block role in correct place in template.
This includes a workaround for a bug or limitation in xref-checker that should be removed when xref-checker is no longer used.
diff --git a/docs/modules/ROOT/pages/index.adoc b/docs/modules/ROOT/pages/index.adoc
index 5a5b284..4230755 100644
--- a/docs/modules/ROOT/pages/index.adoc
+++ b/docs/modules/ROOT/pages/index.adoc
@@ -4,8 +4,11 @@
**We love contributions for this catalog**: you can follow the xref:latest@camel-k::kamelets/kamelets-dev.adoc[Kamelets Developer Guide]
for information on how to create new Kamelets and contribute them to the official https://github.com/apache/camel-kamelets/[github.com/apache/camel-kamelets] repository.
-[.catalog]
-[indexBlock,'xref',relative=!nav.adoc]
+//The `relative=!nav.adoc` filter is needed only to work around a bug or limitation in xref-checker.
+//The filter should be removed when xref-checker is no longer used (i.e. Antora 3 alpha.9 upgrade is complete).
+[indexBlock,xref,relative=!nav.adoc]
----
+[.catalog]
[.item]#{xref}#
+
----
