OSDOCS-12846: custom manifest clarification

Author: skopacz1

installing/installing_with_agent_based_installer/installing-with-agent-based-installer.adoc

@@ -40,6 +40,11 @@ include::modules/installing-ocp-agent-inputs.adoc[leveloffset=+2]
 
 As an optional task, you can create additional manifests to further configure your cluster beyond the configurations available in the `install-config.yaml` and `agent-config.yaml` files.
 
+[IMPORTANT]
+====
+Customizations to the cluster made by additional manifests are not validated, are not guaranteed to work, and might result in a nonfunctional cluster.
+====
+
 // Creating a directory to contain additional manifests
 include::modules/installing-ocp-agent-manifest-folder.adoc[leveloffset=+3]
 

modules/installation-bare-metal-agent-installer-config-yaml.adoc

@@ -16,9 +16,11 @@ baseDomain: example.com <1>
 compute: <2>
 - name: worker
   replicas: 0 <3>
+  architecture: amd64
 controlPlane: <2>
   name: master
   replicas: 1 <4>
+  architecture: amd64
 metadata:
   name: sno-cluster <5>
 networking: