docs: add article for configuring direct namespace creation on OpenShift

Add a procedure article documenting the new `createNamespaceDirectly`
CheCluster CR option that allows administrators to configure Che to
create standard Kubernetes Namespaces instead of using the OpenShift
ProjectRequest API.

Source: eclipse-che/che-operator#2104

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: tolusha

modules/administration-guide/nav.adoc

@@ -41,6 +41,7 @@
 *** xref:configuring-workspace-target-namespace.adoc[]
 *** xref:provisioning-namespaces-in-advance.adoc[]
 *** xref:configuring-a-user-namespace.adoc[]
+*** xref:configuring-direct-namespace-creation-on-openshift.adoc[]
 ** xref:configuring-server-components.adoc[]
 *** xref:mounting-a-secret-as-a-file-or-an-environment-variable-into-a-container.adoc[]
 *** xref:advanced-configuration-options-for-the-che-server-component.adoc[]

modules/administration-guide/pages/configuring-direct-namespace-creation-on-openshift.adoc

@@ -1,11 +1,11 @@
 :_content-type: PROCEDURE
-:description: Configuring {prod-short} to create standard {orch-namespace}s instead of OpenShift projects
+:description: Configuring {prod-short} to create standard {orch-namespace}s instead of {ocp} projects
 :keywords: administration guide, configuring, namespace, openshift, project
-:navtitle: Configuring direct {orch-namespace} creation on OpenShift
+:navtitle: Configuring direct {orch-namespace} creation on {ocp}
 :page-aliases:
 
 [id="configuring-direct-namespace-creation-on-openshift"]
-= Configuring direct {orch-namespace} creation on OpenShift
+= Configuring direct {orch-namespace} creation on {ocp}
 
 By default, on {ocp} clusters, {prod-short} uses the OpenShift ProjectRequest API to create user {orch-namespace}s.
 The ProjectRequest API triggers any cluster-specific Project Templates configured by the cluster administrator.
@@ -30,7 +30,7 @@ spec:
 
 .Verification
 
-* Start a workspace and verify that {prod-short} creates a standard {kubernetes} {orch-namespace} instead of an OpenShift project.
+* Start a workspace and verify that {prod-short} creates a standard {kubernetes} {orch-namespace} instead of an {ocp} project.
 
 .Additional resources