Change page title for findability

Author: kbatuigas

modules/manage/pages/iceberg/choose-iceberg-mode.adoc renamed to modules/manage/pages/iceberg/specify-iceberg-schema.adoc

@@ -1,6 +1,7 @@
-= Choose an Iceberg Mode
+= Specify Iceberg Schema
 :description: Learn about supported Iceberg modes and how you can integrate schemas with Iceberg topics.
 :page-categories: Iceberg, Tiered Storage, Management, High Availability, Data Replication, Integration
+:page-aliases: manage:iceberg/specify-iceberg-schema.adoc 
 :schema-id-val-doc: manage:schema-reg/schema-id-validation.adoc
 // tag::single-source[]