Update navtree heading - Iceberg topics with Snowflake and Open Catalog (#336)

Author: kbatuigas

modules/ROOT/nav.adoc

@@ -400,7 +400,7 @@
 *** xref:manage:iceberg/use-iceberg-catalogs.adoc[]
 *** xref:manage:iceberg/query-iceberg-topics.adoc[]
 *** xref:manage:iceberg/iceberg-topics-databricks-unity.adoc[Query Iceberg Topics with Databricks Unity Catalog]
-*** xref:manage:iceberg/redpanda-topics-iceberg-snowflake-catalog.adoc[Query Iceberg Topics with Snowflake]
+*** xref:manage:iceberg/redpanda-topics-iceberg-snowflake-catalog.adoc[Query Iceberg Topics with Snowflake and Open Catalog]
 ** xref:manage:schema-reg/index.adoc[Schema Registry]
 *** xref:manage:schema-reg/schema-reg-overview.adoc[]
 *** xref:manage:schema-reg/schema-reg-ui.adoc[]