Hide self-managed release notes prerequisite from cloud build (#1707)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Joyce Fee <102751339+Feediver1@users.noreply.github.com>

Author: 3 people

modules/manage/pages/schema-reg/schema-reg-contexts.adoc

@@ -62,7 +62,10 @@ endif::env-cloud[]
 
 Before using Schema Registry contexts, ensure that:
 
+ifndef::env-cloud[]
 * You are running xref:get-started:release-notes/redpanda.adoc[Redpanda v26.1] or later.
+endif::env-cloud[]
+
 * The xref:reference:properties/cluster-properties.adoc#schema_registry_enable_qualified_subjects[`schema_registry_enable_qualified_subjects`] cluster configuration property is set to `true`.
 +
 [IMPORTANT]
@@ -776,10 +779,5 @@ curl -s -X DELETE http://localhost:8081/contexts/.staging
 * xref:manage:schema-reg/schema-reg-authorization.adoc[]
 * link:/api/doc/schema-registry/[Schema Registry API reference]
 * xref:reference:public-metrics-reference.adoc[]
-ifndef::env-cloud[]
-* xref:reference:cluster-properties.adoc[]
-endif::env-cloud[]
-ifdef::env-cloud[]
 * xref:reference:properties/cluster-properties.adoc[]
-endif::env-cloud[]
 // end::single-source[]