Updated two files with the latest OpenShift version.

Author: EricPonvelle

installing/installing_platform_agnostic/installing-platform-agnostic.adoc

@@ -63,7 +63,7 @@ include::modules/installation-user-infra-generate-k8s-manifest-ignition.adoc[lev
 
 To install {product-title} on infrastructure that you provision, you must install {op-system-first} on the machines. When you install {op-system}, you must provide the Ignition config file that was generated by the {product-title} installation program for the type of machine you are installing. If you have configured suitable networking, DNS, and load balancing infrastructure, the {product-title} bootstrap process begins automatically after the {op-system} machines have rebooted.
 
-If your infrastructure supports it, install {op-system} on the machines by following either the steps to use an ISO image or network PXE booting. In some cases, you might be able to upload an appropriate {op-system} image from the link:https://access.redhat.com/downloads/content/290[Product Downloads] page on the Red Hat Customer Portal or the link:https://mirror.openshift.com/pub/openshift-v4/dependencies/rhcos/4.7/[{op-system} image mirror] to your cloud provider and use that image to create the machines.
+If your infrastructure supports it, install {op-system} on the machines by following either the steps to use an ISO image or network PXE booting. In some cases, you might be able to upload an appropriate {op-system} image from the link:https://access.redhat.com/downloads/content/290[Product Downloads] page on the Red Hat Customer Portal or the link:https://mirror.openshift.com/pub/openshift-v4/dependencies/rhcos/4.8/[{op-system} image mirror] to your cloud provider and use that image to create the machines.
 
 [NOTE]
 ====

modules/update-upgrading-web.adoc

@@ -20,7 +20,7 @@ endif::[]
 If updates are available, you can update your cluster from the web console.
 
 You can find information about available {product-title} advisories and updates
-link:https://access.redhat.com/downloads/content/290/ver=4.7/rhel---8/4.7.0/x86_64/product-errata[in the errata section] of the Customer Portal.
+link:https://access.redhat.com/downloads/content/290/ver=4.8/rhel---8/4.8.0/x86_64/product-errata[in the errata section] of the Customer Portal.
 
 .Prerequisites