OCPBUGS-34007:adding mirror registry reminder

Author: Brendan Daly

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

@@ -25,7 +25,7 @@ The following procedures deploy a single-node {product-title} in a disconnected
 // Downloading the Agent-based Installer
 include::modules/installing-ocp-agent-download.adoc[leveloffset=+2]
 
-//Verifying architectures 
+//Verifying architectures
 include::modules/agent-installer-architectures.adoc[leveloffset=+2]
 
 // Creating the preferred configuration inputs
@@ -35,6 +35,7 @@ include::modules/installing-ocp-agent-inputs.adoc[leveloffset=+2]
 .Additional resources
 * xref:../../installing/installing_vsphere/ipi/installing-vsphere-installer-provisioned-customizations.adoc#configuring-vsphere-regions-zones_installing-vsphere-installer-provisioned-customizations[Configuring regions and zones for a VMware vCenter]
 * xref:../../installing/installing_with_agent_based_installer/installing-with-agent-based-installer.adoc#agent-install-verifying-architectures_installing-with-agent-based-installer[Verifying the supported architecture for installing an Agent-based installer cluster]
+* xref:../../installing/installing_with_agent_based_installer/understanding-disconnected-installation-mirroring.adoc#configuring-the-agent-based-installer-to-use-mirrored-images[Configuring the Agent-based Installer to use mirrored images]
 
 [id="installing-ocp-agent-opt-manifests_{context}"]
 === Optional: Creating additional manifest files

modules/installing-ocp-agent-inputs.adoc

@@ -128,7 +128,11 @@ platform:
     - 192.168.11.4
     - 2001:DB8::5
 ----
-
++
+[NOTE]
+====
+When you use a disconnected mirror registry, you must add the certificate file that you created previously for your mirror registry to the `additionalTrustBundle` field of the `install-config.yaml` file.
+====
 . Create the `agent-config.yaml` file:
 +
 [source,terminal]