Update Iceberg xrefs

Author: kbatuigas

docs-data/property-overrides.json

@@ -965,7 +965,7 @@
       "description": "Default value for the `redpanda.iceberg.invalid.record.action` topic property.",
       "related_topics": [
         "self-managed-only: xref:reference:properties/topic-properties.adoc#redpanda-iceberg-invalid-record-action[`redpanda.iceberg.invalid.record.action`]",
-        "self-managed-only: xref:manage:iceberg/about-iceberg-topics.adoc#troubleshoot-errors[Troubleshoot errors]"
+        "self-managed-only: xref:manage:iceberg/iceberg-troubleshooting.adoc[Troubleshoot Iceberg Topics]"
       ],
       "config_scope": "cluster"
     },
@@ -1710,7 +1710,7 @@
     "redpanda.iceberg.invalid.record.action": {
       "description": "Whether to write invalid records to a dead-letter queue (DLQ).",
       "related_topics": [
-        "xref:manage:iceberg/about-iceberg-topics.adoc#troubleshoot-errors[Troubleshoot errors]"
+        "xref:manage:iceberg/iceberg-troubleshooting.adoc[Troubleshoot Iceberg Topics]"
       ],
       "config_scope": "topic"
     },
@@ -1724,7 +1724,7 @@
     "redpanda.iceberg.partition.spec": {
       "description": "The link:https://iceberg.apache.org/docs/nightly/partitioning/[partitioning^] specification for the Iceberg table.",
       "related_topics": [
-        "xref:manage:iceberg/about-iceberg-topics.adoc#use-custom-partitioning[Use custom partitioning]"
+        "xref:manage:iceberg/iceberg-performance-tuning.adoc#use-custom-partitioning[Use custom partitioning]"
       ],
       "config_scope": "topic"
     },