DOC-840 Fix iceberg small details (#898)

Author: Deflaimun

modules/manage/pages/topic-iceberg-integration.adoc

@@ -58,7 +58,7 @@ When you enable the Iceberg integration for a Redpanda topic, Redpanda brokers s
 
 == Enable Iceberg integration
 
-To create an Iceberg table for a Redpanda topic, you must set the cluster configuration property xref:reference:properties/cluster-properties.adoc#iceberg_enabled[`iceberg_delete`] to `true`, and also configure the topic property xref:reference:properties/topic-properties.adoc#redpandaicebergmode[`redpanda.iceberg.mode`]. You can choose to provide a schema if you need the Iceberg table to be structured with defined columns.
+To create an Iceberg table for a Redpanda topic, you must set the cluster configuration property xref:reference:properties/cluster-properties.adoc#iceberg_enabled[`iceberg_enabled`] to `true`, and also configure the topic property xref:reference:properties/topic-properties.adoc#redpandaicebergmode[`redpanda.iceberg.mode`]. You can choose to provide a schema if you need the Iceberg table to be structured with defined columns.
 
 . Set the `iceberg_enabled` configuration option on your cluster to `true`. You must restart your cluster if you change this configuration for a running cluster. 
 +
@@ -72,7 +72,7 @@ rpk cluster config set iceberg_enabled true
 Successfully updated configuration. New configuration version is 2.
 ----
 
-. Create a new topic.
+. (Optional) Create a new topic.
 +
 [,bash,]
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